Ledford, J. L. (2006). Cut the cord!: The consumer's guide to VoIP. Thomson Course Technology PTR.
芝加哥风格引文Ledford, Jerry L. Cut the Cord!: The Consumer's Guide to VoIP. Boston, MA: Thomson Course Technology PTR, 2006.
MLA引文Ledford, Jerry L. Cut the Cord!: The Consumer's Guide to VoIP. Thomson Course Technology PTR, 2006.
警告：这些引文格式不一定是100％准确.