Gaya APA

Cunningham, W, P., Saigo, B, W. (2001). Environmental science : a global concern (10 th Ed.). New York: McGraw-Hill Higher Education.

Gaya MLA

Cunningham, William, P.., Saigo, Barbara, Woodwroth. "Environmental science : a global concern". 10 th Ed. New York: McGraw-Hill Higher Education, 2001. Text.