Cita APA (7th ed.)

Brass, P. (1993). Circles (1. Auflage.). Belhue Press.

Cita Chicago (17th ed.)

Brass, Perry. Circles. 1. Auflage. New York: Belhue Press, 1993.

Cita MLA (8th ed.)

Brass, Perry. Circles. 1. Auflage. Belhue Press, 1993.