Siess, J. A. (2001). The OPL sourcebook: A guide for solo and small libraries. Information Today.
芝加哥风格引文Siess, Judith A. The OPL Sourcebook: A Guide for Solo and Small Libraries. Medford, New Jersey: Information Today, 2001.
MLA引文Siess, Judith A. The OPL Sourcebook: A Guide for Solo and Small Libraries. Information Today, 2001.
警告：这些引文格式不一定是100％准确.