000 00231 a2200085 4500
020 _a9780702177101
082 _a302.2072 DUPL
100 _aDu Plooy ,G.M.
_951753
245 _aCommunication research techniques ,methods and applications
999 _c759904
_d759903
942 _w392
_xVeronica Mrwebi
_y392
_zVeronica Mrwebi