Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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