Liber sextus (1298), Constitutiones Clementinae (1317), Extravagantes Joannis P. XXII., Extravagantes communes [text-searchable pdf]
In Corpus Iuris Canonici, volume 2. Edited by Emil Friedberg. Leipzig: Bernhard Tauchnitz, 1881. Reprint Graz: Akademische Druck- u. Verlagsanstalt, 1959. PDF hosted by HathiTrust.
Giovani D’Andrea, Glossa ordinaria (1326) [high-resolution digital images]
Corpus juris canonici with Glossa ordinaria. Rome, 1582. Hosted by UCLA Library.