APA (7th ed.) Citation

Probert, W. L. (1957). Electric speed-torque device based on magnetic principles. Electrical Engineering., 76, 55.

Chicago Style (17th ed.) Citation

Probert, W. L. "Electric Speed-torque Device Based on Magnetic Principles." Electrical Engineering. 76 (1957): 55.

MLA (9th ed.) Citation

Probert, W. L. "Electric Speed-torque Device Based on Magnetic Principles." Electrical Engineering., vol. 76, 1957, p. 55.