National Council for Geographic Education. Geography teacher. Routledge.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Council for Geographic Education. Geography Teacher. New York: Routledge.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Council for Geographic Education. Geography Teacher. Routledge.
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