Gaya APA

Ehrlich, P, R., Beattie, A. (2004). Wild solutions : how biodiversity is money in the bank (2 rd Ed.). New Haven dan London: Yale University Press.

Gaya MLA

Ehrlich, Paul, R.., Beattie, Andrew. "Wild solutions : how biodiversity is money in the bank". 2 rd Ed. New Haven dan London: Yale University Press, 2004. Text.