Não informado. (1878). Statistical Abstract of the United States. U.S. Department of Commerce, Bureau of the Census.
Chicago-referens (17:e uppl.)Não informado. Statistical Abstract of the United States. Washington: U.S. Department of Commerce, Bureau of the Census, 1878.
MLA-referens (8:e uppl.)Não informado. Statistical Abstract of the United States. U.S. Department of Commerce, Bureau of the Census, 1878.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.