COFER, C. N., FITZGERALD, H. E., & HERMANSON, R. H. (1975). Programed learning aid for human memory and forgetting. Richard D. Irwin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCOFER, Charles N., Hiram E. FITZGERALD, और Roger H. HERMANSON. Programed Learning Aid for Human Memory and Forgetting. Homewood: Richard D. Irwin, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCOFER, Charles N., et al. Programed Learning Aid for Human Memory and Forgetting. Richard D. Irwin, 1975.
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