Cita APA (7a ed.)
Hornaday, W. T., & Sanborn, E. R. (1927). Official Guide Book to the New York Zoological Park. New York Zoological Society.
Cita estilo Chicago (17a ed.)
Hornaday, William T., y Elwin R. Sanborn. Official Guide Book to the New York Zoological Park. Nueva York, EUA: New York Zoological Society, 1927.
Cita MLA (9a ed.)
Hornaday, William T., y Elwin R. Sanborn. Official Guide Book to the New York Zoological Park. New York Zoological Society, 1927.
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