1. To facilitate ready reference this list of references is sectioned to indicate references (1) to theories and methods of measurement of attention, (2) to investigations of attention of preschool subjects, and (3) to studies of child development
2. Baldwin, J. M. 1905.Dictionary of philosophy and psychology, Vol. 1, xxiv+644New York: Macmillan.
3. Boring, E. G. 1929.A history of experimental psychology, 699New York: Century.
4. Attention and Interest