APA (7th ed.) Citation

Dummer, G. W. A. (1963). Variable resistors and potentiometers (2. ed.). Pitman.

Chicago Style (17th ed.) Citation

Dummer, Geoffrey W. A. Variable Resistors and Potentiometers. 2. ed. London: Pitman, 1963.

MLA (9th ed.) Citation

Dummer, Geoffrey W. A. Variable Resistors and Potentiometers. 2. ed. Pitman, 1963.