1. Bindra, D., & Waksberg, Helene. Methods and terminology in studies of time estimation. Psychol. Bull, 1956, 53, 155–159.
2. Blum, G. S. A model of the mind. New York: Wiley, 1961.
3. Blum, G. S. Programming people to simulate machines. In S. S. Tomkins and S. Messick (Eds.), Computer simulation of personality. New York: Wiley, 1963.
4. Geiwitz, P. J. The structure of boredom. Unpublished doctoral dissertation, Univer. of Michigan, 1964.
5. Loehlin, J. C. The influence of different activities on the apparent length of time. Psychol. Monogr., 1959, 73, No. 4(Whole No. 474).