APA (7th ed.) Zitazioa

Cofer, C. N. (1972). Programmed learning aid for introduction to psychology. Learning systems co..

Chicago Style (17th ed.) Zitazioa

Cofer, Charles N. Programmed Learning Aid for Introduction to Psychology. Illinois: Learning systems co., 1972.

MLA (9th ed.) Zitazioa

Cofer, Charles N. Programmed Learning Aid for Introduction to Psychology. Learning systems co., 1972.