Ledford, J. L., & Jerri L. Ledford. (2006). Cut the cord!: The consumer's guide to VoIP. Boston, MA: Thomson Course Technology.
Trích dẫn kiểu ChicagoLedford, Jerri L., và Jerri L. Ledford. Cut the Cord!: The Consumer's Guide to VoIP. Boston, MA: Thomson Course Technology, 2006.
MLA引文Ledford, Jerri L., và Jerri L. Ledford. Cut the Cord!: The Consumer's Guide to VoIP. Boston, MA: Thomson Course Technology, 2006.
警告:这些引文格式不一定是100%准确.