Não informado. (1944). Surveying and mapping. American Congress on Surveying and Mapping.
Chicago-referens (17:e uppl.)Não informado. Surveying and Mapping. Washington: American Congress on Surveying and Mapping, 1944.
MLA-referens (8:e uppl.)Não informado. Surveying and Mapping. American Congress on Surveying and Mapping, 1944.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.
