Gaya APA

Cunningham, W, P., Cunningham, M, A. (2009). Principles of environmental science inquiry and applications (Fifth edition). New York: Mc Graw-Hill.

Gaya MLA

Cunningham, William, P., Cunningham, Mary, Ann. "Principles of environmental science inquiry and applications". Fifth edition New York: Mc Graw-Hill, 2009. Text.