Judkins, C. J. (1949). National association of the United States. U.S. Dept. of Commerce.
Lua i Stíl Chicago (17ú heag.)Judkins, Calvert Jay. National Association of the United States. Washington: U.S. Dept. of Commerce, 1949.
Lua MLA (9ú heag.)Judkins, Calvert Jay. National Association of the United States. U.S. Dept. of Commerce, 1949.
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