Fitzgerald, A. E., Kingsley, C., Umans, S. D., Kingsley, C., Jr., Kingsley, C. J., & Kingsley, C. (1992). Electric machinery (5th ed. in SI units.). London: McGraw-Hill.

Fitzgerald, A. E., Charles Kingsley, Stephen D. Umans, Charles Kingsley, Jr, Charles J. Kingsley, and Charles Kingsley. Electric Machinery. 5th ed. in SI units. London: McGraw-Hill, 1992.

Fitzgerald, A. E., et al. Electric Machinery. 5th ed. in SI units. London: McGraw-Hill, 1992.