Hein, L. E. (1966). Enjoying the outdoors with children. Association Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHein, Lucille E. Enjoying the Outdoors with Children. New York: Association Press, 1966.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHein, Lucille E. Enjoying the Outdoors with Children. Association Press, 1966.
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