Gaya APA

Investigation in environmental geology / Duncan Foley, Garry D. McKenzie, Russel O. Utgard. (1999). : Upper Saddle River, N.J., Prentice Hall.

Gaya MLA

Investigation in environmental geology / Duncan Foley, Garry D. McKenzie, Russel O. Utgard. 2nd ed.. : Upper Saddle River, N.J., Prentice Hall, 1999. Text.