1. Harper, R. S. (1950). The first psychological laboratory. Isis, 41(2), 158–161.
2. Hilgard, E. R. (1977). Divided consciousness: Multiple controls in human thought and action. New York: Wiley-Interscience.
3. Hilgard, E. R. (1987). Psychology in America: A historical survey. New York: Harcourt Brace Jovanovich.
4. James, W. (1890/1980). Principles of psychology. Cambridge, MA: Harvard University Press.
5. James, W. (1902/1985). The varieties of religious experience: A study in human nature. Cambridge, MA: Harvard University Press.