Não informado. (1974). American cartographer. American Congress on Surveying and Mapping.
Chicago-referens (17:e uppl.)Não informado. American Cartographer. Washington: American Congress on Surveying and Mapping, 1974.
MLA-referens (8:e uppl.)Não informado. American Cartographer. American Congress on Surveying and Mapping, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.