Gaya APA

Legget, R, F., Hatheway, A, W. (1988). Geology and Engineering, 3rd Edition . New York: McGraw-Hill Book Company.

Gaya MLA

Legget, Robert, F.., Hatheway, Allen, W.. "Geology and Engineering, 3rd Edition". New York: McGraw-Hill Book Company, 1988. Text.