Crowley, W. R. (1997). Chemicals on the Internet: A directory of industry sites. Gulf Pub. Co.
芝加哥风格引文Crowley, William R. Chemicals on the Internet: A Directory of Industry Sites. Houston, Tex: Gulf Pub. Co, 1997.
MLA引文Crowley, William R. Chemicals on the Internet: A Directory of Industry Sites. Gulf Pub. Co, 1997.
警告：这些引文格式不一定是100％准确.