Gaya APA

Enger, E, D. et al (1992). Enviromental Science: a Study of Interrelationships (Ed. 4.--). Dubque: WM. C. Brown.

Gaya MLA

Enger, Eldon, D.. et al. "Enviromental Science: a Study of Interrelationships". Ed. 4.-- Dubque: WM. C. Brown, 1992. Text.