National Research Council (U.S.). Highway Research Board. (1952). Mapping and subsurface exploration for engineering purposes. Highway Research Board.
Chicago-referens (17:e uppl.)National Research Council (U.S.). Highway Research Board. Mapping and Subsurface Exploration for Engineering Purposes. Washington, D.C: Highway Research Board, 1952.
MLA-referens (9:e uppl.)National Research Council (U.S.). Highway Research Board. Mapping and Subsurface Exploration for Engineering Purposes. Highway Research Board, 1952.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.