Hornaday, W. T. (1909). Popular official guide to the New York zoological park (10th ed.). New York Zoological Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHornaday, William T. Popular Official Guide to the New York Zoological Park. 10th ed. New York: New York Zoological Society, 1909.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHornaday, William T. Popular Official Guide to the New York Zoological Park. 10th ed. New York Zoological Society, 1909.
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