F., L., R., W., H., A.(1988).Geology and engineering / Robert F. Legget, Allen W. Hatheway (Ed.3, Cet.1).New York:McGraw-Hill book company.
Gaya MLA
Legget, Robert, F.., Hatheway, Allen, W.."Geology and engineering / Robert F. Legget, Allen W. Hatheway".Ed.3, Cet.1New York:McGraw-Hill book company,1988.Textbook.