00370nam a22001457a 450000500170000001000130001702000240003003500130005403700200006708200100008710000190009724500510011626000370016730000200020420180704155957.0  aB-217741  a81840500070c550.00  aB-217741  bReference Press  a302.2  aNandi, Charles  aPrinciples of communication/cby Charles Nandi  aNew DelhibReference Pressc2006  a238p.c22cm(Hb)