Franklin

MLA

John, E. Roy. Contributions to the Study of the Problem-solving Process. [Washington: American Psychological Association, 1958.

APA

John, E. Roy. (1958). Contributions to the study of the problem-solving process. [Washington: American Psychological Association.

Chicago

John, E. Roy Contributions to the Study of the Problem-Solving Process. [Washington: American Psychological Association, 1958.