APA (7th ed.) Citation

Millikan, R. A., Gale, H. G., & Pyle, W. R. (1920). Practical physics. Ginn.

Chicago Style (17th ed.) Citation

Millikan, Robert Andrews, Henry Gordon Gale, and Willard R. Pyle. Practical Physics. Boston: Ginn, 1920.

MLA (9th ed.) Citation

Millikan, Robert Andrews, et al. Practical Physics. Ginn, 1920.