Cita APA (7a ed.)

Heinlein, R. A. (1987). Friday (9 print.). Ballantine Books.

Cita Chicago Style (17a ed.)

Heinlein, Robert Anson. Friday. 9 print. New York: Ballantine Books, 1987.

Cita MLA (9a ed.)

Heinlein, Robert Anson. Friday. 9 print. Ballantine Books, 1987.