Cita APA (7th ed.)

McCall, R. B., Cofer, C. N., & Hermanson, R. H. (1975). Programmed learning aid for intelligence and heredity. Learning Systems Company.

Cita Chicago (17th ed.)

McCall, Robert B., Charles N. Cofer, i Roger H. Hermanson. Programmed Learning Aid for Intelligence and Heredity. Homewood, Illinois: Learning Systems Company, 1975.

Cita MLA (9th ed.)

McCall, Robert B., et al. Programmed Learning Aid for Intelligence and Heredity. Learning Systems Company, 1975.