United States of America. Department of Commerce. Bureau of the Census. (1918). Negro population: 1790-1915. Department of Commerce.
Cita Chicago Style (17a ed.)United States of America. Department of Commerce. Bureau of the Census. Negro Population: 1790-1915. Washington: Department of Commerce, 1918.
Cita MLA (9a ed.)United States of America. Department of Commerce. Bureau of the Census. Negro Population: 1790-1915. Department of Commerce, 1918.
Precaución: Estas citas no son 100% exactas.