1. The impact of playground design on the play behaviors of children with differing levels of physical competence;Barbour;Early Childhood Research Quarterly,1999
2. It's time for creative play;Beckwith;Parks and Recreation,1982
3. No more cookie cutter parks;Beckwith,1998
4. Why our playgrounds are boring to today's wired child;Beckwith,2000
5. Dramatic play in outdoor play environments;Brown,2006