Brushless excitation.

MLA

Dillman, T. L., et al. “Brushless Excitation.” IEEE Spectrum, vol. 9, no. 3, Jan. 1972, pp. 58–66. EBSCOhost, https://doi.org/10.1109/MSPEC.1972.5218751.

APA

Dillman, T. L., Keay, F. W., Raczkowski, C., Skooglund, J. W., & South, W. H. (1972). Brushless excitation. IEEE Spectrum, 9(3), 58–66. https://doi.org/10.1109/MSPEC.1972.5218751

Chicago

Dillman, T. L., F. W. Keay, C. Raczkowski, J. W. Skooglund, and W. H. South. 1972. “Brushless Excitation.” IEEE Spectrum 9 (3): 58–66. doi:10.1109/MSPEC.1972.5218751.