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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThe Journal of Environmental Education. Madison, Wis.: Dembar Educational Research Services, 1971.
एमएलए (9वां संस्करण) प्रशस्ति पत्रThe Journal of Environmental Education. Dembar Educational Research Services, 1971.
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