Gaya APA

Cunningham, W, P., Saigo, B, W. (2001). Environmental Science : A GLobal Concern (Ed.6). New York: McGraw-Hill.

Gaya MLA

Cunningham, William, P.., Saigo, Barbara, Woodworth. "Environmental Science : A GLobal Concern". Ed.6 New York: McGraw-Hill, 2001. Text.