APA (7th ed.) Citation

New York Aquarium, New York Zoological Society, & Townsend, C. H. (1919). Guide to the New York Aquarium. New York Zoological Society.

Chicago Style (17th ed.) Citation

New York Aquarium, New York Zoological Society, and Charles Haskins Townsend. Guide to the New York Aquarium. New York: New York Zoological Society, 1919.

MLA (8th ed.) Citation

New York Aquarium, et al. Guide to the New York Aquarium. New York Zoological Society, 1919.