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2. The effects of sociodramatic play on problem-solving behavior among culturally disadvantaged preschool children;Elkin Rosen;Child Development,1974
3. Theories of play;Elkonin;Journal of Russian and East European Psychology,2005
4. To be successful--let them play! childhood education;Hurwitz;Career and Technical Education,2002
5. Lopez, C. M., &Lopez, V. V. C. (2006). Guía práctica del juego en el niño y su adaptación en necesidades especificas. Granada: Universidad de Granada.