Roddy D., Electronic Communication 4th ed Textual Documents - 4th ed. - New Delhi Dorling Kindersley (India) Pvt.Ltd. Licensees of Pearson Education 2011 - xi/723: p.b.; 24*18. ISBN: 9788177582 Subjects--Index Terms: Dig. Communication Dewey Class. No.: 621.382 / ROD/COO