APA (7th ed.) Citation

Hilgard, E. R., & Bower, G. H. (1956). Theories of learning (2nd ed.). Appleton-Century-Crofts.

Chicago Style (17th ed.) Citation

Hilgard, Ernest R., and Gordon H. Bower. Theories of Learning. 2nd ed. New York: Appleton-Century-Crofts, 1956.

MLA (9th ed.) Citation

Hilgard, Ernest R., and Gordon H. Bower. Theories of Learning. 2nd ed. Appleton-Century-Crofts, 1956.