APA (7th ed.) Citation

Hilgard, E. R. (1956). Theories of learning (2. ed.). Appleton-Century-Crofts.

Chicago Style (17th ed.) Citation

Hilgard, Ernest R. Theories of Learning. 2. ed. New York: Appleton-Century-Crofts, 1956.

MLA (9th ed.) Citation

Hilgard, Ernest R. Theories of Learning. 2. ed. Appleton-Century-Crofts, 1956.