Cita APA (7a ed.)

Juan XXI, P., & Spruyt, J. (1989). Peter of Spain on composition and negation. Ingenium.

Cita Chicago Style (17a ed.)

Juan XXI, Papa, y Joke Spruyt. Peter of Spain on Composition and Negation. Nijmegen, The Netherlands: Ingenium, 1989.

Cita MLA (9a ed.)

Juan XXI, Papa, y Joke Spruyt. Peter of Spain on Composition and Negation. Ingenium, 1989.