Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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