APA (7th ed.) Citation

ScienceDirect (Online service), Whitehurst, G. J., & Zimmerman, B. J. (1979). The Functions of language and cognition. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Grover J. Whitehurst, and Barry J. Zimmerman. The Functions of Language and Cognition. New York: Academic Press, 1979.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. The Functions of Language and Cognition. Academic Press, 1979.