Gaya APA

FOLEY, D, ;, M, G, D, ;, U, R, O. (2009). Investigations in Environmental Geology Third Edition . : Pearson-Prentice Hall.

Gaya MLA

FOLEY, Duncan, ;, McKENZIE,, Garry, D., ;, UTGARD,, Russel, O.. "Investigations in Environmental Geology Third Edition". : Pearson-Prentice Hall, 2009. Buku.