Hornaday, W. T. (1909). Popular official guide to the New York zoological park (10th ed.). New York Zoological Society.
Lua i Stíl Chicago (17ú heag.)Hornaday, William T. Popular Official Guide to the New York Zoological Park. 10th ed. New York: New York Zoological Society, 1909.
Lua MLA (9ú heag.)Hornaday, William T. Popular Official Guide to the New York Zoological Park. 10th ed. New York Zoological Society, 1909.
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