Gaya APA

Sayre, A, P. (2002). Sacrets of Sound: Studying the Calls and Songs of Whales, Elephants, and Birds . : Houghton Mifflin Company Ltd..

Gaya MLA

Sayre, April, Pulley. "Sacrets of Sound: Studying the Calls and Songs of Whales, Elephants, and Birds". : Houghton Mifflin Company Ltd., 2002. Textbook.