APA (7th ed.) Citation

Westwater, F. L., & Waddell, W. A. (1961). An introduction to servomechanisms. English Universities Press.

Chicago Style (17th ed.) Citation

Westwater, F. L., and W. A. Waddell. An Introduction to Servomechanisms. London: English Universities Press, 1961.

MLA (9th ed.) Citation

Westwater, F. L., and W. A. Waddell. An Introduction to Servomechanisms. English Universities Press, 1961.