Widdison, H. A. (1998). Social problems 98/99. Dushkin/McGraw-Hill.
芝加哥风格引文Widdison, Harold A. Social Problems 98/99. Guilford, CT.: Dushkin/McGraw-Hill, 1998.
MLA引文Widdison, Harold A. Social Problems 98/99. Dushkin/McGraw-Hill, 1998.
警告：这些引文格式不一定是100％准确.