APA (7th ed.) Citation

Caplan, G. (1955). Emotional problems of early childhood ([1st ed.].). Basic Books.

Chicago Style (17th ed.) Citation

Caplan, Gerald. Emotional Problems of Early Childhood. [1st ed.]. New York: Basic Books, 1955.

MLA (9th ed.) Citation

Caplan, Gerald. Emotional Problems of Early Childhood. [1st ed.]. Basic Books, 1955.