Cita APA (7a ed.)

Hornaday, W. T. (1909). Popular official guide to the New York zoological park (10th ed.). New York Zoological Society.

Cita Chicago Style (17a ed.)

Hornaday, William T. Popular Official Guide to the New York Zoological Park. 10th ed. New York: New York Zoological Society, 1909.

Cita MLA (9a ed.)

Hornaday, William T. Popular Official Guide to the New York Zoological Park. 10th ed. New York Zoological Society, 1909.