APA استشهاد

Kolstad, C. D. (2000). Enviornmental economics. 2000. Oxford University Press.

استشهاد بنمط شيكاغو

Kolstad, Charles D. Enviornmental Economics. 2000. New York: Oxford University Press, 2000.

MLA استشهاد

Kolstad, Charles D. Enviornmental Economics. 2000. Oxford University Press, 2000.