APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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