APA (7th ed.) Citation

Zelazo, P. R., Kearsley, R. B., & Ungerer, J. (1984). Learning to speak: A manual for parents. L. Erlbaum.

Chicago Style (17th ed.) Citation

Zelazo, Philip R., Richard B. Kearsley, and Judy Ungerer. Learning to Speak: A Manual for Parents. Hillsdale, N.J: L. Erlbaum, 1984.

MLA (9th ed.) Citation

Zelazo, Philip R., et al. Learning to Speak: A Manual for Parents. L. Erlbaum, 1984.