American Oil Company. (1967). American traveler's guide to Negro history (3rd ed.). American Oil Co..
芝加哥风格引文American Oil Company. American Traveler's Guide to Negro History. 3rd ed. Chicago: American Oil Co., 1967.
MLA引文American Oil Company. American Traveler's Guide to Negro History. 3rd ed. American Oil Co., 1967.
警告：这些引文格式不一定是100％准确.