1. Baird. J. W. (1917). The legibility of a telephone directory. Journal of Applied Psychology, 1(1), 30–37. https://doi.org/10.1037/h0072081.
2. Ballantyne, P. F. (1999). Walter B. Pillsbury. American National Biography, 17, 524–525
3. Boring, E. G. (1927). Edward Bradford Titchener: 1867–1927. American Journal of Psychology, 38, 489–506. http://www.jstor.com/stable/1414392
4. Boring, E. G. (1929). A history of experimental psychology. D. Appleton-Century
5. Boring, E. G. (1950). A history of experimental psychology (2nd ed.). Appleton-Century-Crofts