Cita APA (7a ed.)

O'Donnell, R. (1955). Nine mediaeval thinkers. [editor no identificat].

Cita Chicago Style (17a ed.)

O'Donnell, Reginal. Nine Mediaeval Thinkers. Toronto: [editor no identificat], 1955.

Cita MLA (9a ed.)

O'Donnell, Reginal. Nine Mediaeval Thinkers. [editor no identificat], 1955.