Gaya APA

Ricklefs, R., Relyea, R. (2014). Ecology : the economy of nature (7th ed.). New York: W.H. Freeman and Company.

Gaya MLA

Ricklefs, Robert., Relyea, Rick. "Ecology : the economy of nature". 7th ed. New York: W.H. Freeman and Company, 2014. Text.