Paul, C. R., Nasar, S. A., Unnewehr, L. E. 1., Nasar, S., Unnewehr, L. E., Nasar, S. A., & Unnewehr, L. (1992). Introduction to electrical engineering (2nd ed.). New York ; London: McGraw-Hill.

Paul, Clayton R., S. A. Nasar, L. E. 1925- Unnewehr, S.A Nasar, L. E. Unnewehr, S. A. Nasar, and L.E Unnewehr. Introduction to Electrical Engineering. 2nd ed. New York ; London: McGraw-Hill, 1992.

Paul, Clayton R., et al. Introduction to Electrical Engineering. 2nd ed. New York ; London: McGraw-Hill, 1992.