Gaya APA

Sayre, A, P. (2002). Secrets of Sound : studying the calls and songs of whales, elephants, and birds . Boston: Houghton Mifflin Company.

Gaya MLA

Sayre, April, Pulley. "Secrets of Sound : studying the calls and songs of whales, elephants, and birds". Boston: Houghton Mifflin Company, 2002. Text.