APA (7th ed.) Citation

Harris, M. R., Lawrenson, P. J., & Stephenson, J. M. (1970). Per-unit systems: With special reference to electrical machines. Univ. Press.

Chicago Style (17th ed.) Citation

Harris, M. R., P. J. Lawrenson, and J. M. Stephenson. Per-unit Systems: With Special Reference to Electrical Machines. Cambridge: Univ. Press, 1970.

MLA (9th ed.) Citation

Harris, M. R., et al. Per-unit Systems: With Special Reference to Electrical Machines. Univ. Press, 1970.