Gaya APA

Cunningham, W, C, W, P. (2006). Principles of environmental science : inquiry and application.-- (Ed. 3.--). America: McGraw-Hill.

Gaya MLA

Cunningham, William, Cunningham,, William, P.. "Principles of environmental science : inquiry and application.--". Ed. 3.-- America: McGraw-Hill, 2006. Buku.