Canon Law

Leipzig: Bernhard Tauchnitz, 1879-1881. 2 volumes.
This collection contains the six major canonical collections on which the 1917 Code is based: the Decretum of Gratian, the Decretals of Gregory IX, the Liber sextus of Boniface VIII, the Constitutions of Clement V, the Extravagantes of John XXII, and the Extravagantes communes.
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.
For print version locations, see the UofT Library Catalogue.

Edited by Pietro Gasparri.
Rome: Typis Polyglottis Vaticanis, 1923. 9 volumes.
This collection reproduces all the documents cited in footnotes to the 1917 Code – with the exception of those found in the Corpus iuris canonici. It includes numerous conciliar, papal, and curial texts.
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.
For print version locations, see the UofT Library Catalogue.

Washington, DC: Catholic University of America Press, 1999-present. 4 volumes published.
Vol. 1 (ca. 400-1140); vol. 2 (1140-1234); vol. 3 (Early Middle Ages); vol. 4 (Byzantine and Eastern, to 1500).
When complete, this series will be the major secondary source about canon law up to 1500. It includes essays by different canonists.

Edited by Anders Winroth and John C. Wei.
Cambridge: Cambridge University Press, 2022.