Quick Reference Sources on St. Cyril:
Cambridge Companion to The Apostolic Fathers
Westminster Handbook to Patristic Theology (McGuckin, 2004)
Wikipedia on Cyril: an excellent overview
The Early Christian World (Philip Esler, Ed.) 2017
NOTE: Many more articles may be available on Cyril that are not full-text online, but available from our library or via Interlibrary loan. Simply use the online catalog as follows: If you are looking for books/articles written BY Cyril you should search our online catalog or databases for his name as an AUTHOR. If you want to find resources ABOUT Cyril, search for his name as SUBJECT (or a related subject: "Coptic Church", for example).
Luther Sem Library has 100+ Books (or chapters) on Cyril (here), including several EBOOKS here; plus many others available by ILL here
Also consult the following databases for helpful articles or abstracts on Cyril:
For hundreds of Primary and Secondary source materials on Cyril, see this JSTOR link (Luther Sem students)
Circumcision of the Spirit in the soteriology of Cyril of Alexandria. (Author: Jonathan Stephen Morgan) PhD thesis 2013
For digital resources, including rare manuscripts, on/of Cyril of Alexandria, see the Digital Vatican Library