DeGregorio, W. A. (1993). The complete book of U.S. presidents (4th ed.). Wings Books.
芝加哥风格引文DeGregorio, William A. The Complete Book of U.S. Presidents. 4th ed. New York: Wings Books, 1993.
MLA引文DeGregorio, William A. The Complete Book of U.S. Presidents. 4th ed. Wings Books, 1993.
警告：这些引文格式不一定是100％准确.