Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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

Precaución: Estas citas no son 100% exactas.