APA (7th ed.) Citation

Valletutti, P. J., & Dummett, L. (1992). Cognitive development: A functional approach. Singular Publishing Group.

Chicago Style (17th ed.) Citation

Valletutti, Peter J., and Leonie Dummett. Cognitive Development: A Functional Approach. San Diego, Calif.: Singular Publishing Group, 1992.

MLA (9th ed.) Citation

Valletutti, Peter J., and Leonie Dummett. Cognitive Development: A Functional Approach. Singular Publishing Group, 1992.