Charman, A. (1996). I wonder why trees have leaves, and other questions about plants. Kingfisher.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCharman, Andrew. I Wonder Why Trees Have Leaves, and Other Questions About Plants. New York: Kingfisher, 1996.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCharman, Andrew. I Wonder Why Trees Have Leaves, and Other Questions About Plants. Kingfisher, 1996.
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