Electronic communications /
Raina, K B.
Electronic communications / K B Raina. - 2nd ed. - [S.l.] : Delmar Cengage Learning, 2007. - 240 p. ; 24 cm.
Electronic communications / K B Raina. - 2nd ed. - [S.l.] : Delmar Cengage Learning, 2007. - 240 p. ; 24 cm.