APA Citation

Jan XXI., p., & Zell, U. (1487). Summulae logicales. [Köln: Ulrich Zell].

Chicago Style Citation

Jan XXI., papež, and Ulrich Zell. Summulae Logicales. [Köln: Ulrich Zell], 1487.

MLA Citation

Jan XXI., papež, and Ulrich Zell. Summulae Logicales. [Köln: Ulrich Zell], 1487.

Warning: These citations may not always be 100% accurate.