National Automobile Chamber of Commerce. (1920). Facts and figures of the automobile industry. National Automobile Chamber of Commerce.
Lua i Stíl Chicago (17ú heag.)National Automobile Chamber of Commerce. Facts and Figures of the Automobile Industry. New York: National Automobile Chamber of Commerce, 1920.
Lua MLA (8ú heag.)National Automobile Chamber of Commerce. Facts and Figures of the Automobile Industry. National Automobile Chamber of Commerce, 1920.
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