Cita APA (7th ed.)

Holt, M., & Dienes, Z. P. (1973). Let's play math. Penguin Books.

Cita Chicago (17th ed.)

Holt, Michael, i Zoltan Paul Dienes. Let's Play Math. Middlesex, Eng: Penguin Books, 1973.

Cita MLA (9th ed.)

Holt, Michael, i Zoltan Paul Dienes. Let's Play Math. Penguin Books, 1973.