Tennessee Valley Authority. (1951). Surveying, mapping and related engineering.
Chicago-referens (17:e uppl.)Tennessee Valley Authority. Surveying, Mapping and Related Engineering. Washington, U. S. Govt. Print. Off, 1951.
MLA-referens (9:e uppl.)Tennessee Valley Authority. Surveying, Mapping and Related Engineering. 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.