Gaya APA

Sayre, A, P. (2002). Secret of Sound : Studying The Calls and Songs of Whales, Elephants and Birds . Boston, Massachusetts: Houghton Mifflin Company.

Gaya MLA

Sayre, April, Pulley. "Secret of Sound : Studying The Calls and Songs of Whales, Elephants and Birds". Boston, Massachusetts: Houghton Mifflin Company, 2002. Text.