Gaya APA

ENGER, E, D, S, B, F, B, A, T. (2006). Environmental Science. A Study of Interrelationships. Tenth Edition . : McGraw Hill.

Gaya MLA

ENGER, Eldon, D.;, SMITH,, Bradley, F.;, BOCKARIE,, Anne, Todd. "Environmental Science. A Study of Interrelationships. Tenth Edition". : McGraw Hill, 2006. Buku.