APA (7th ed.) Citation

Rickard, T. A., & Ralston, O. C. (1921). Concentration by flotation. J. Wiley & Sons [etc., etc.].

Chicago Style (17th ed.) Citation

Rickard, T. A., and Oliver C. Ralston. Concentration by Flotation. New York: J. Wiley & Sons [etc., etc.], 1921.

MLA (9th ed.) Citation

Rickard, T. A., and Oliver C. Ralston. Concentration by Flotation. J. Wiley & Sons [etc., etc.], 1921.