See this legally free ebook:
- The Doctrine of the Communion of Saints in the Ancient Church: a Study in the History of Dogma, by Dr. J.P. Kirsch, translated with the author’s permission by John R. M’Kee of the Oratory (Edinburgh, London: Sands & Company, 1910). With Imprimatur. Available in various formats at Open Library and Internet Archive, with a second copy at Internet Archive and Open Library.
On the Feast of All Saints in the Latin Church (Roman Rite), the Syro-Malabar Catholic church, and the Maronite Catholic church.