Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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