- The inner world of daydreaming
- Mind-Play: The Creative Uses of Fantasy (Spectrum Book)
- Imagination and Play in the Electronic Age
- The House of Make-Believe: Childrens Play and the Developing Imagination
- Repression and Dissociation: Implications for Personality Theory, Psychopathology and Health (The John D. and Catherine T. MacArthur Foundation Series on Mental Health and De)