Gaya APA

Cunningham, W, P., Cunningham, M, A. (2006). Principles of environmental science (Third edition). : The McGraw-Hill.New York.

Gaya MLA

Cunningham, William, P., Cunningham, Mary, Ann. "Principles of environmental science". Third edition : The McGraw-Hill.New York, 2006. Skripsi, Tesis, Disertasi.