APA (7th ed.) Citation

Watts, A. F. (1948). The language and mental development of children: An essay in educational psychology. D. C. Heath.

Chicago Style (17th ed.) Citation

Watts, Albert Frank. The Language and Mental Development of Children: An Essay in Educational Psychology. Boston: D. C. Heath, 1948.

MLA (9th ed.) Citation

Watts, Albert Frank. The Language and Mental Development of Children: An Essay in Educational Psychology. D. C. Heath, 1948.