Cita APA (7th ed.)

Shaffner, G. (1999). The arithmetic of life. Ballantine Books.

Cita Chicago (17th ed.)

Shaffner, George. The Arithmetic of Life. Nueva York: Ballantine Books, 1999.

Cita MLA (9th ed.)

Shaffner, George. The Arithmetic of Life. Ballantine Books, 1999.