Sheldon, S. (2001). The sky is falling. Compass Press, HarperCollins Publishers.
芝加哥风格引文Sheldon, Sidney. The Sky Is Falling. London ; Oxford ; Melbourne: Compass Press, HarperCollins Publishers, 2001.
MLA引文Sheldon, Sidney. The Sky Is Falling. Compass Press, HarperCollins Publishers, 2001.
警告：这些引文格式不一定是100％准确.