Fitzgerald, Arthur E. Electric machinery A. E. Fitzgerald, Charles Kingsley, Jr., Stephen D. Umans - 5th [rev.] ed. in SI units - New York : McGraw-Hill, 1992 - 599 s. - McGraw-Hill series in electrical engineering. . ISBN: 0-07-707708-3 0-07-112946-4 Dewey Class. No.: 621.31042 621.310 42 621.310 42