See this worth-it ebook and audiobook:

  • The Latin Mass Explained: Everything Needed to Understand and Appreciate the Traditional Latin Mass, by Msgr. George J. Moorman, with a  Foreword by R. Michael Schmitz, Vicar General, Institute of Christ the King Sovereign Priest (Charlotte: NC: TAN Books, 2007). With Imprimatur. The ebook, printed book, and mp3 audio are available on this page of TAN Books. The ebook and audiobook are available at Google Play Books. The printed book is available at Barnes & Noble.

See also the related texts and ebooks listed on the Project index page Liturgy, the 07 July 2014 post “Free ebook: “Explanation of the Holy Sacrifice of the Mass”, by Martin von Cochem“, and the 08 July 2020 post “Worth-it ebook: “The Genius and Timeliness of the Traditional Latin Mass”, by Peter Kwasniewski“; and the following texts and ebooks:

On the anniversary of the issuance of the Apostolic Letter Given Motu Proprio “Summorum Pontificum” on the Use of the Roman Liturgy Prior to the Reform of 1970, by Pope Benedict XVI (7 July 2007). For other texts and ebooks, you may access the List of Free eBooks (Arranged by Title), the List of Free eBooks (Grouped by Subject), the List of Worth-It Catholic Books & eBooks, and the main page of the Catholic eBooks Project.

Oremus:

Our God and Savior Jesus Christ, we thank You for giving us Summorum Pontificum through Your faithful vicar Benedict, who thus affirmed and strengthened our liberty to celebrate the ancient liturgies of the Latin Church. Grant that we, who are nourished by the continuing tradition of Your Body the Church, may be ever filled with Your grace and truth, that we might remain in Your love until death and dwell with You forever in heaven. Amen.