00402nam a2200133 a 450000500170000000800410001704100080005808200100006610000210007624500780009726400470017530000110022265000350023320260717090937.0260717s1974    ii            000 0 eng d  aeng04a530.51 aHancock, John C.13aAn introduction to the principle communication theory /cHancock, John C. 1aDelhi :bTata McGraw-hill pub. Co.,c1974.  a253 p. 4aPrinciple communication theory