Gaya APA

Sayre, A, P. (1998). Secrets of sound: Studying the calls and songs of whales elephats, and birds . New York: Houghton Mifflin Company.

Gaya MLA

Sayre, April, Pulley. "Secrets of sound: Studying the calls and songs of whales elephats, and birds". New York: Houghton Mifflin Company, 1998. Text.