Church History

By J.N.D. Kelly and Michael Walsh.
3rd edition. New York: Oxford University Press, 2005.
A chronological arrangement of concise biographies of the popes and major anti-popes. The bibliographies include primary sources as well as specialized and more general studies.

Edited by Basil Watkins.
8th edition. London : Bloomsbury T&T Clark, 2016.
For print version locations, see the UofT Library Catalogue.
The most complete list of saints and blesseds in English. Very brief biographies including birth and death years and feast days.

New full edition. Edited by Paul Burns.
Collegeville, MN: Liturgical Press, 1995-2000. 12 volumes + 1 supplement.
The standard English-language reference work on the saints; biographies are arranged according to the feast day of the saint. This work provides the best brief biographies of the saints together with excellent bibliographies.
Several volumes are available online:
October; November; beatified or canonized from 1999 to 2003.
The 1956 edition edited by Herbert Thurston and Donald Attwater (online) is still sometimes useful.

By John J. Delaney and James Edward Tobin.
Garden City, NY: Doubleday, 1961.
For print version locations, see the UofT Library Catalogue.
A biographical dictionary of "outstanding Catholics from the time of the Apostles to the present day". Contains some 16,000 brief entries, many citing one or two sources.
The online version is available on the Internet Archive, a trusted source, but one for which it is necessary to create a free account and login.