Cita APA (7th ed.)

Cofer, C. N. (1975). Programmed learning aid for human memory and forgetting. Learning Systems.

Cita Chicago (17th ed.)

Cofer, Charles Norval. Programmed Learning Aid for Human Memory and Forgetting. Homewood, Ill: Learning Systems, 1975.

Cita MLA (9th ed.)

Cofer, Charles Norval. Programmed Learning Aid for Human Memory and Forgetting. Learning Systems, 1975.