1. Spontaneous play: An avenue for intellectual development;Almy;Young Children,1967
2. Piaget, play, and problem solving;Athey,1974
3. A child learns to write and read;Bissex,1980
4. Qualitative research for educators: An introduction to theory and method;Bogdan,1982
5. Developmental correlates of role-playing ability;Bowers;Child Development,1975