APA
Waldorf.W.A, Sollid.E & Newell..C.S. (1939). The Energy Method of Calculating natural Vibration Periods of Structures Applied to Dams. United States Department of the Interior, Bureau of Reclamation: United States.
Chicago
Waldorf.W.A, Sollid.E and Newell..C.S. 1939. The Energy Method of Calculating natural Vibration Periods of Structures Applied to Dams. United States Department of the Interior, Bureau of Reclamation: United States.
Harvard
Waldorf.W.A, Sollid.E and Newell..C.S. (1939). The Energy Method of Calculating natural Vibration Periods of Structures Applied to Dams. United States Department of the Interior, Bureau of Reclamation: United States.
MLA
Waldorf.W.A, Sollid.E and Newell..C.S. The Energy Method of Calculating natural Vibration Periods of Structures Applied to Dams. United States Department of the Interior, Bureau of Reclamation: United States. 1939.