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Lua i Stíl Chicago (17ú heag.)Historical Statistics of the United States 1789-1945: A Supplement to the Statistical Abstract of the United States / Prepared by the Bureau of the Census with the Cooperation of the Social Science Research Council, 1949. Washington: U.S. Gov. Print. Off., 1949.
Lua MLA (8ú heag.)Historical Statistics of the United States 1789-1945: A Supplement to the Statistical Abstract of the United States / Prepared by the Bureau of the Census with the Cooperation of the Social Science Research Council, 1949. U.S. Gov. Print. Off., 1949.