Hilgard, E. R., & Bower, G. H. (1956). Theories of learning (2nd ed.). Appleton-Century-Crofts.
Lua i Stíl Chicago (17ú heag.)Hilgard, Ernest R., agus Gordon H. Bower. Theories of Learning. 2nd ed. New York: Appleton-Century-Crofts, 1956.
Lua MLA (9ú heag.)Hilgard, Ernest R., agus Gordon H. Bower. Theories of Learning. 2nd ed. Appleton-Century-Crofts, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.