American Oil Company. (1967). American traveler's guide to Negro history (3rd ed.). American Oil Co..
Citace podle Chicago (17th ed.)American Oil Company. American Traveler's Guide to Negro History. 3rd ed. Chicago: American Oil Co., 1967.
Citace podle MLA (8th ed.)American Oil Company. American Traveler's Guide to Negro History. 3rd ed. American Oil Co., 1967.
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