Cita APA (7a ed.)

Swain, R. L., & Nichols, E. D. (1965). Understanding arithmetic. Holt, Rinehart and Winston.

Cita Chicago Style (17a ed.)

Swain, Robert L., y Eugene D. Nichols. Understanding Arithmetic. New York: Holt, Rinehart and Winston, 1965.

Cita MLA (8a ed.)

Swain, Robert L., y Eugene D. Nichols. Understanding Arithmetic. Holt, Rinehart and Winston, 1965.