APA (7th ed.) Citation

Clark, R. S. (1922). An experimental study of silent thinking. [s.n.].

Chicago Style (17th ed.) Citation

Clark, Ruth Swan. An Experimental Study of Silent Thinking. New York: [s.n.], 1922.

MLA (9th ed.) Citation

Clark, Ruth Swan. An Experimental Study of Silent Thinking. [s.n.], 1922.