Cita APA (7th ed.)

Sitomer, M., & Sitomer, H. (1971). Circles. Thomas Y. Crowell.

Cita Chicago (17th ed.)

Sitomer, Mindel, i Harry Sitomer. Circles. New York: Thomas Y. Crowell, 1971.

Cita MLA (9th ed.)

Sitomer, Mindel, i Harry Sitomer. Circles. Thomas Y. Crowell, 1971.