1. Observations on physical activity in physical locations: age, gender, ethnicity, and month effects.;Baranowski;Res Q Exerc Sport,1993
2. Impact of pre-school environment upon children's physical activity and sun exposure Am J Prev Med.;Boldemann,2006
3. The childcare environment and children's physical activity.;Bower;Am J Prev Med,2008
4. Observational System for Recording Physical Activity in Children - Preschool Version.;Brown;Res Q Exerc Sport,2006
5. The contribution of preschool playground factors in explaining children's physical activity during recess.;Cardon;Int J Behav Nutr Phys Act,2008