Hornaday, W. T. (1911). Popular official guide to the New York zoological park (11th ed.). New York zoological society.
Lua i Stíl Chicago (17ú heag.)Hornaday, William T. Popular Official Guide to the New York Zoological Park. 11th ed. New York: New York zoological society, 1911.
Lua MLA (9ú heag.)Hornaday, William T. Popular Official Guide to the New York Zoological Park. 11th ed. New York zoological society, 1911.
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