Cita APA (7a ed.)

Pirenne, H. (1957). Mohammed and Charlemagne. Meridian Book.

Cita Chicago Style (17a ed.)

Pirenne, Henri. Mohammed and Charlemagne. New York: Meridian Book, 1957.

Cita MLA (8a ed.)

Pirenne, Henri. Mohammed and Charlemagne. Meridian Book, 1957.