Book, W. F. (1932). Economy and technique of learning. D. C. Heath.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBook, William Frederick. Economy and Technique of Learning. Boston: D. C. Heath, 1932.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBook, William Frederick. Economy and Technique of Learning. D. C. Heath, 1932.
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