Cita APA

Bullough, D. A. (1966). The age of Charlemagne ([1st American ed.].). Putnam.

Citación estilo Chicago

Bullough, Donald A. The Age of Charlemagne. [1st American ed.]. New York: Putnam, 1966.

Cita MLA

Bullough, Donald A. The Age of Charlemagne. [1st American ed.]. Putnam, 1966.