Cofer, C. N., Fitzgerald, H. E., & Hermanson, R. H. (1975). Programmed learning aid for human memory and forgetting. Learning Systems Company.
Цитирование в стиле Чикаго (17-е изд.)Cofer, Charles N., Hiram E. Fitzgerald, и Roger H. Hermanson. Programmed Learning Aid for Human Memory and Forgetting. Homewood, Illinois: Learning Systems Company, 1975.
Цитирование MLA (9-е изд.)Cofer, Charles N., et al. Programmed Learning Aid for Human Memory and Forgetting. Learning Systems Company, 1975.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.