United States. Bureau of the Census. (1985). Statistical abstract of the United States (105th ed.). U.S. Dept. of Commerce, Bureau of the Census.
Lua i Stíl Chicago (17ú heag.)United States. Bureau of the Census. Statistical Abstract of the United States. 105th ed. Washington: U.S. Dept. of Commerce, Bureau of the Census, 1985.
Lua MLA (9ú heag.)United States. Bureau of the Census. Statistical Abstract of the United States. 105th ed. U.S. Dept. of Commerce, Bureau of the Census, 1985.
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