Cofer, C. N. (1972). Programmed learning aid for introduction to psychology. Learning systems co..
Lua i Stíl Chicago (17ú heag.)Cofer, Charles N. Programmed Learning Aid for Introduction to Psychology. Illinois: Learning systems co., 1972.
Lua MLA (9ú heag.)Cofer, Charles N. Programmed Learning Aid for Introduction to Psychology. Learning systems co., 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.