APA استشهاد

Nebel, B. J. (1987). Environmental science: The way the world works (2nd ed.). Prentice Hall.

استشهاد بنمط شيكاغو

Nebel, Bernad J. Environmental Science: The Way the World Works. 2nd ed. New Jersey: Prentice Hall, 1987.

MLA استشهاد

Nebel, Bernad J. Environmental Science: The Way the World Works. 2nd ed. Prentice Hall, 1987.