Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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