000 00293nam a22001337a 4500
020 _a9789327276541
082 _a630.715 RAY
100 _aG.L RAY
245 _aExtension Communication and Management
250 _a8
260 _aNew Delhi
_bKalyani
_c2017
300 _a382
942 _cBK
999 _c227127
_d227127