Duff, John R. Alternating current fundamentals / John R. Duff, Stephen L. Herman - Third edition - New York : Delmar Publishers Inc., 1986. - vii, 663 pages : illustrations ; 24 cm. Includes index ISBN: 0827322399 Subjects--Topical Terms: Electric currentsElectric engineering LC Class. No.: TK 1141 D84 1986 CIRC