Hall, G. S., Titchener, E. B., Dallenbach, K. M., Bentley, M., Boring, E. G., & Washburn, M. F. The American journal of psychology. University of Illinois Press.

Hall, G. Stanley, Edward Bradford Titchener, Karl M. Dallenbach, Madison Bentley, Edwin Garrigues Boring, and Margaret Floy Washburn. The American Journal of Psychology. Urbana: University of Illinois Press.

Hall, G. Stanley, et al. The American Journal of Psychology. University of Illinois Press.