O'Kelley, D., & Simmons, S. (1968). Introduction to generalized electrical machine theory. McGraw-Hill.

O'Kelley, Denis, and S. Simmons. Introduction to Generalized Electrical Machine Theory. London, New York: McGraw-Hill, 1968.

O'Kelley, Denis, and S. Simmons. Introduction to Generalized Electrical Machine Theory. McGraw-Hill, 1968.