Barnard, H. C. (1949). Principles and practice of geografhy teaching. University Tutorial Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBarnard, H. C. Principles and Practice of Geografhy Teaching. University Tutorial Press, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBarnard, H. C. Principles and Practice of Geografhy Teaching. University Tutorial Press, 1949.
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