APA (7th ed.) Citation

Elkind, D., Cofer, C. N., & Hermanson, R. H. (1975). Programmed learning aid for cognitive development. Learning Systems Company.

Chicago Style (17th ed.) Citation

Elkind, David, Charles N. Cofer, and Roger H. Hermanson. Programmed Learning Aid for Cognitive Development. Homewood, Illinois: Learning Systems Company, 1975.

MLA (9th ed.) Citation

Elkind, David, et al. Programmed Learning Aid for Cognitive Development. Learning Systems Company, 1975.