APA

Hilgard E. R., . (1956). Theories of learning. New York: Appleton-Century-Crofts.

Chicago

Hilgard Ernest Ropiequet, . 1956. Theories of learning. New York: Appleton-Century-Crofts.

Harvard

Hilgard E. R., . (1956). Theories of learning. New York: Appleton-Century-Crofts.

MLA

Hilgard Ernest Ropiequet, . Theories of learning. New York: Appleton-Century-Crofts. 1956.