Froman, R. (1974). A game of functions. Thomas Y. Crowell.
Cita Chicago (17th ed.)Froman, Robert. A Game of Functions. New York: Thomas Y. Crowell, 1974.
Cita MLA (9th ed.)Froman, Robert. A Game of Functions. Thomas Y. Crowell, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.