Gaya APA

Cunningham, W, P., Cunningham, M, A. (2006). Principles of environmental science : inquiry and applications / William P. Cunningham, Mary Ann Cunningham (ed. 3). New York: McGraw-Hill.

Gaya MLA

Cunningham, William, P.., Cunningham, Mary, Ann.. "Principles of environmental science : inquiry and applications / William P. Cunningham, Mary Ann Cunningham". ed. 3 New York: McGraw-Hill, 2006. Buku.