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2. Bol~g, R (1984) Play in hospltal settings In T Yawkey & A Pellegr~n~ (Eds ), Play Developmental and applud H~llsdale, NJ Earlbaum
3. Bowlby, J (1969) Attachment and loss Vol 1 Attachment New York Baskc Books
4. Chance P (1979) Learntng through play Skillman, NJ Johnson &Johnson Baby Products