APA (7th ed.) Citation

Tongren, S. (1981). What's for lunch: Animal feeding at the zoo. GMG Pub..

Chicago Style (17th ed.) Citation

Tongren, Sally. What's for Lunch: Animal Feeding at the Zoo. New York: GMG Pub., 1981.

MLA (9th ed.) Citation

Tongren, Sally. What's for Lunch: Animal Feeding at the Zoo. GMG Pub., 1981.