1. Bakwin, R. M. and Bakwin, H. 1942.Psychologic Care During Infancy and Childhood, xv+317New York: D. Appleton-Century.
2. Imaginary companions of children.
3. Breckenridge, M. E. and Vincent, E. L. 1943.Child Development: Physical and Psychological Growth Through the School Years, ix+592Philadelphia: Saunders.
4. A Study in Imagination
5. The Observation of Children at the Worcester Normal School