00980pamaa2200289 4500 0000037834 20190517090000.0 9780789668066 (pbk.) BNM HD30.335 SHE 2004 Shelly, Gary B. author Business data communications : introductory concepts and techniques Gary B. Shelly, Thomas J. Cashman and Judy A. Serwatka. Fourth edition. Boston: Course Technology, [2004] ♭2004. various pages: color illustration; 28 cm. text rdacontent unmediated rdamedia volume rdacarrier Shelly Cashman Series DMIT Computer networks Data transmission systems Business -- Data processing Business -- Communication systems Office practice -- Automation Cashman, Thomas J. Serwatka, Judy A.