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https://www.academia.edu/23050679/Learning_to_Spell_Proficiently_Best_Practices_from_a_Spe…

…f the United States of America. North American Montessori Teachers Association. Web pages: NAMTA, http://www.montessori-namta.org (accessed December 21, 2012). Parten, M. (1932). Social participation among preschool children. Journal of Abnormal and Social Psychology, 27: 243–269…