APA

Legget R. F., . (1939). Geology and Engineering. New York: McGraw-Hill.

Chicago

Legget Robert F, . 1939. Geology and Engineering. New York: McGraw-Hill.

Harvard

Legget R. F., . (1939). Geology and Engineering. New York: McGraw-Hill.

MLA

Legget Robert F, . Geology and Engineering. New York: McGraw-Hill. 1939.