000 00297nam a2200133Ia 4500
100 _aShrader, Robert L
020 _a0-07-066563-x
250 _a4th ed
942 _cBK
245 _aElectronic communication
260 _aMcGraw - Hill, London
_c1981
082 _a621.38 Shr
300 _axiv;801
999 _c36770
_d36770