Hanna, Keith, Mastering Skype for business 2015 / Keith Hanna. - 1 online resource (1,079 pages) : illustrations (chiefly color) Includes index. ISBN: 9781119225379 Subjects--Uniform Titles: Skype (Electronic resource) Subjects--Topical Terms: Internet telephony. Index Terms--Genre/Form: Electronic books. LC Class. No.: TK5105.8865 / .H36 2016