Sheldon, D. (2009). Into the deep: The life of naturalist and explorer William Beebe. Charlesbridge.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSheldon, David. Into the Deep: The Life of Naturalist and Explorer William Beebe. Watertown, Mass,: Charlesbridge, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSheldon, David. Into the Deep: The Life of Naturalist and Explorer William Beebe. Charlesbridge, 2009.
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