APA-referens (7:e uppl.)

Levin, J. R. (1977). Learner differences: Diagnosis and prescription. Holt, Rinehart and Winston.

Chicago-referens (17:e uppl.)

Levin, Joel R. Learner Differences: Diagnosis and Prescription. New York: Holt, Rinehart and Winston, 1977.

MLA-referens (9:e uppl.)

Levin, Joel R. Learner Differences: Diagnosis and Prescription. Holt, Rinehart and Winston, 1977.