References

This is a list of encyclopaedia, dictionaries, and other reference texts. Catechisms have been moved to the page Catechisms and Explanations of the Faith. Codes of ecclesiastical law have been moved to the page Law, Ecclesiastical. For other legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject). 

• The Book of Saints: a dictionary of servants of God canonized by the Catholic Church, extracted from the Roman & other martyrologies, compiled by the Benedictine monks of St. Augustine’s Abbey, Ramsgate (London: A. & C. Black, Ltd., 1921). With Imprimatur. Available at Internet Archive and Open Library.
• A Catholic Dictionary: containing some account of the doctrine, discipline, rites, ceremonies, councils, and religious orders of the Catholic Church, by William Edward Addis and Thomas Arnold (London: Kegan Paul, Trench & Co., 1884). With Imprimatur. Available at Internet Archive.
• A Catholic Dictionary: containing some account of the doctrine, discipline, rites, ceremonies, councils, and religious orders of the Catholic Church, 6^th edition, with additions, by William Edward Addis and Thomas Arnold (New York: Catholic Publication Society, 1887). With Imprimatur. Available at Internet Archive and Open Library.
• The Catholic Encyclopedia: An International Work of Reference on the Constitution, Doctrine, Discipline, and History of the Catholic Church, in 16 volumes, edited by Charles G. Herbermann, Ph.D., LL.D., Edward A. Pace, Ph.D., D.D., and Conde B Pallen, Ph.D., LL.D. (New York: Robert Appleton Company, 1907; The Encyclopedia Press, 1913). With Imprimatur. May be read online on this page at New Advent (copyright Kevin Knight, 2012), with active links to other relevant articles and to relevant Bible passages; on this page at e-Catholic 2000 (copyright 1999-2016, e-Catholic2000.com); on this page at CatholiCity; at Catholic Online; and at Wikisource. The individual volumes may be downloaded in various formats (pdf, epub, kindle/mobu, etc.) from the links at the Online Books Page.
• Catholic Pocket Dictionary and Cyclopedia; Containing a Brief Explanation of the Doctrines, Discipline, Rites, Ceremonies and Councils of the Holy Catholic Church, Including an Abridged Account of the Religious Orders, to which is Added “One Hundred and Fifty Important Facts in Church History Explained”, compiled from approved sources by Rev. James J. McGovern (Chicago, Ill.: Extension Press, 1906). With Imprimatur. Available at Hathitrust Digital Library; and may be read online on this page of e-Catholic 2000. Also available in pdf, epub, mobi/kindle, and other formats at Internet Archive and Open Library, with a 2^nd copy at Internet Archive, and a microform copy at Internet Archive and Open Library.
• Compendium of the Catechism of the Catholic Church (Copyright 2005, Libreria Editrice Vaticana). May be read in multiple languages on the website of the Holy See.
• A Dictionary of Canon Law, 2^nd revised edition, by the Rev. P. Trudel (St. Louis, Mo.; London: B. Herder Book Co., 1919) With Imprimatur. Available at Internet Archive and Open Library.
• Ang Dila Natong Bisaya [Our Visayan Language], by Manuel Yap. With Imprimatur dated 1947. Available at Internet Archive, which states: “A grammar book on the Cebuano language written in Cebuano by a native speaker. Cebuano is the main language of the Philippines. Published in 1949 in the Philippines. The author was a Catholic Bishop. This book is recommended by the English-Cebuano dictionary by Cabonce that is sold in the Philippines.”
• Ecclesiastical Dictionary; Containing, in Concise Form, Information upon Ecclesiastical, Biblical, Archaeological, and Historical Subjects, by John Thein (New York, Cincinnati, Chicago: Benziger Brothers, 1900). With Imprimatur. Available at Open Library and Internet Archive.
• A Grammar of Plainsong: in two parts, by the Benedictines of Stanbrook [Abbey] (London: Burns & Oates, Art & Book Co.; New York, Cincinnati, Chicago: Benziger Brothers, 1905). With Imprimatur. Available at Open Library and Internet Archive.
• The Manual of the Holy Catholic Church, Part 2, embracing: First Part: The beautiful teachings of the holy Catholic Church simplified and explained in the form of questions and answers…, the whole supported by Fifteen Hundred Proofs from the Sacred Scriptures; Second Part: Light from the altar; or, The true Catholic in the church of Christ…; To which is added a Catholic home dictionary and cyclopedia…; The whole adapted… by the Rev. James J. McGovern. (Chicago, Ill.: Catholic Art and Publication Office, 1906). With Imprimatur. Available at Open Library.
• New Catholic Dictionary (1910). Available online at the Catholic Community Forum.
• The New Raccolta: Or, Collection of Prayers and Good Works, to which the Sovereign Pontiffs Have Attached Holy Indulgences. Published in 1898 by Order of His Holiness, Pope Leo XIII. From the Third Italian Edition, Authorized and Approved by the Sacred Congregation of Holy Indulgences, To Which is Added an Appendix Containing Prayers for Mass, and Vespers for Sunday (Philadelphia: Peter F. Cunningham & Son, 1903) With Imprimatur and with approbation from the Sacred Congregation of Indulgences and Holy Relics. Available in various formats at Internet Archive and Open Library.
• The Raccolta or Collection of Indulgenced Prayers & Good Works, translated by Ambrose St John of the Oratory of St Philip Neri, Birmingham (London: Burns & Oates; New York, Chicago, Cincinnati Benziger Bros, 1910). With Imprimatur. May be downloaded in PDF format through the Saints’ Books index. May also be read online or downloaded in various formats (PDF, EPUB, Kindle, Daisy, Full Text DjVu) at Internet Archive and Open Library (Digitizing sponsor: MSN, Book contributor: Kelly Library, University of Toronto).
• Saints of the Society of Jesus; with a Sketch of the Society, by Rev. D.A. Merrick, S.J. (New York, Chicago, Montreal, Toronto: William H. Sadlier, 1891). May be read online, and available in pdf, epub, kindle and other formats, at Internet Archive.
• Sources of Catholic Dogma, translated from the Enchiridion symbolorum, definitionum et declarationum de rebus fidei et morum, first edited by Heinrich Joseph Dominicus Denzinger. Available on Catechetics Online and Catholic Fidelity. [N.B. According to Wikipedia, it incorporates documents to 1950 and uses old numbering only.] The Latin text is available on Bibliotheque Catholicque en ligne (Catholic Library Online).
• The Summa Contra Gentiles, by Saint Thomas Aquinas, translated by the English Dominican Fathers (London: Burns Oates & Washbourne, [NB, The source information states: New York: Benzinger Brothers], 1924). With Imprimatur. Available online at Saint Wiki.
• The Summa Contra Gentiles, or On the Truth of the Catholic Faith, by St. Thomas Aquinas, translated by Anton C. Pegis,  James F. Anderson, Vernon J. Bourke, and Charles J. O’Neil (New York: Hanover House, 1955-57). Edited, with English, especially Scriptural references, updated by Joseph Kenny, O.P.  Available at the website of the Dominican House of Studies, Priory of the Immaculate Conception. Parallel texts in Latin and English available at the website of Joseph Kenny.
• Summa Theologica [or Summa Theologiae], by Saint Thomas Aquinas, translated by the Fathers of the English Dominican Province (Second and Revised Edition, 1920). With Imprimatur. May be read on on this page of New Advent, with links to quoted passages of the Sacred Scriptures and relevant Catholic Encyclopedia articles. Another edition (Benziger Bros., 1947) may be read on this page of the Dominican House of Studies, Priory of the Immaculate Conception. The parallel Latin and English texts, the latter from the Dominican translation, may be read on this page (Part I, Part IIa, Part IIb, Part III) of the Logic Museum Wiki and on this page of the old Logic Museum.
• A Thought from Dominican Saints for Each Day of the Year, translated by a Sister of Charity (New York, Cincinnati, St. Louis: Benziger Brothers, 1886). Available in pdf, mobi, epub and other formats at Internet Archive; and available at HathiTrust Digital Library. A reprint may be purchased at Amazon UK.