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.