Soni, M.L..etal. A Text Book On Power System Engineering / M.L. SONI,P.V.GUPTA, U.S. BHATNAGAR A.CHAKRABARTI - Delhi : Dhanpat Rai Publishing, 1998 - 1020 p ISBN: 8177000209 330.00 Dewey Class. No.: 621.3191 / T395