Perkins, L. R. (2010). As easy as falling off the face of the earth. Greenwillow Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPerkins, Lynne Rae. As Easy as Falling off the Face of the Earth. New York: Greenwillow Books, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPerkins, Lynne Rae. As Easy as Falling off the Face of the Earth. Greenwillow Books, 2010.
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