Cita APA

Birkhoff, G. D., & Beatley, R. (1959). Basic geometry (3rd ed.).

Chicago Edition Citation

Birkhoff, George David, i Ralph Beatley. Basic Geometry. 3rd ed. 1959.

Cita MLA

Birkhoff, George David, i Ralph Beatley. Basic Geometry. 3rd ed. 1959.

Atenció: Aquestes cites poden no estar 100% correctes.