Gaya APA

Sayre, A, P. (2002). Secrets of sound : studyng the calls and songs of whales, elephants, and birds . New York: Houghton Mifflin.

Gaya MLA

Sayre, April, Pulley. "Secrets of sound : studyng the calls and songs of whales, elephants, and birds". New York: Houghton Mifflin, 2002. Text.