(1939). Foundations of educational psychology; nature's gifts to man. Longmans.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFoundations of Educational Psychology; Nature's Gifts to Man. New York: Longmans, 1939.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFoundations of Educational Psychology; Nature's Gifts to Man. Longmans, 1939.
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