Sitomer, M., & Sitomer, H. (1974). Spirals. Thomas Y. Crowell.
Cita Chicago (17th ed.)Sitomer, Mindel, i Harry Sitomer. Spirals. New York: Thomas Y. Crowell, 1974.
Cita MLA (9th ed.)Sitomer, Mindel, i Harry Sitomer. Spirals. Thomas Y. Crowell, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.