1. Designing playful interactions for social interaction and physical play
2. Doris Bergen. 1988. Play As a Medium for Learning and Development: A Handbook of Theory and Practice. MD: Association for Childhood Education International. Olney. Doris Bergen. 1988. Play As a Medium for Learning and Development: A Handbook of Theory and Practice. MD: Association for Childhood Education International. Olney.
3. Doris Bergen. 1998. Play from Birth to Twelve and Beyond: Contexts Perspectives and Meanings. Psychology Press New York Routledge. Doris Bergen. 1998. Play from Birth to Twelve and Beyond: Contexts Perspectives and Meanings. Psychology Press New York Routledge.
4. Getting a grip on tangible interaction