APA

Commins W., . (1937). Principles of educational psychology. New York: The Ronald press company.

Chicago

Commins W, . 1937. Principles of educational psychology. New York: The Ronald press company.

Harvard

Commins W., . (1937). Principles of educational psychology. New York: The Ronald press company.

MLA

Commins W, . Principles of educational psychology. New York: The Ronald press company. 1937.