Gupta, Prakash C. creator text 832 p Prentice-Hall of India Pvt.Ltd 1999 . [S.l.] monographic Data Communications 8120348648 (paperback) 9788120348646 (paperback) http://www.amazon.com/exec/obidos/ASIN/8120348648/chopaconline-20 http://www.amazon.com/exec/obidos/ASIN/8120348648/chopaconline-20