Trask, P. D. (1959). Engineering Geology Case Histories No.3. GSA.
Chicago Edition CitationTrask, Parker D. Engineering Geology Case Histories No.3. NewYork: GSA, 1959.
Cita MLATrask, Parker D. Engineering Geology Case Histories No.3. GSA, 1959.
Atenció: Aquestes cites poden no estar 100% correctes.