000 00303nam a2200109Ia 4500
008 231219s9999 xx 000 0 und d
041 _aeng
100 _aWilliam A.Shay
245 _aUnderstanding Data Communications & Networks
260 _bVikas Pubs. House Pvt ltd ,New Delhi
650 _aManagement
999 _c978219
_d978219