APA (7th ed.) Citation

Hornaday, W. T. Popular Official Guide to the New York Zoological Park (September 1915) Thirteenth Edition.

Chicago Style (17th ed.) Citation

Hornaday, William T. Popular Official Guide to the New York Zoological Park (September 1915) Thirteenth Edition.

MLA (9th ed.) Citation

Hornaday, William T. Popular Official Guide to the New York Zoological Park (September 1915) Thirteenth Edition.

Warning: These citations may not always be 100% accurate.