Cita APA (7th ed.)

American Geological Institute. (2012). Environmental science. Cengage Learning Asia Pte Ltd.

Cita Chicago (17th ed.)

American Geological Institute. Environmental Science. Pasig City, Philippines: Cengage Learning Asia Pte Ltd, 2012.

Cita MLA (9th ed.)

American Geological Institute. Environmental Science. Cengage Learning Asia Pte Ltd, 2012.

Atenció: Aquestes cites poden no estar 100% correctes.