APA (7th ed.) Citation

Collard, S. B., & Kratter, P. (2002). Butterfly count. Holiday House.

Chicago Style (17th ed.) Citation

Collard, Sneed B., and Paul Kratter. Butterfly Count. New York: Holiday House, 2002.

MLA (8th ed.) Citation

Collard, Sneed B., and Paul Kratter. Butterfly Count. Holiday House, 2002.

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