Cita APA (7a ed.)

Ritter, G. (1968). Frederick the Great: An historical profile. Eyre & Spottiswoode.

Cita Chicago Style (17a ed.)

Ritter, Gerhard. Frederick the Great: An Historical Profile. London: Eyre & Spottiswoode, 1968.

Cita MLA (9a ed.)

Ritter, Gerhard. Frederick the Great: An Historical Profile. Eyre & Spottiswoode, 1968.