"play." 3. Encyclopedia - Britannica. N.p.: n.p., n.d. Encyclopedia Britannica, Inc. Web. 20 Nov. 2009.
"RECESS IN ELEMENTARY SCHOOLS." NASPE Position Statement AAHPERD,
2006. Web. 18 Nov. 2009. The NASPE is the National Association of Sport and Physical Education put out a position statement which stated the importance of recess in elementary schools. The NASPE is sponsored by its mother association AAHPERD which is the American Alliance for Health, Physical Education, Recreation and Dance.
Barros, Romina M.; Silver, Ellen J.; Stein, Ruth E. K.. “School Recess and Group Classroom Behavior” Pediatrics, Feb2009, Vol. 123 Issue 2, p431-436, 6p; DOI: 10.1542/peds.2007-2825; (AN 36464288) Dr. Romina Barros is a MD and pediatrician in the Bronx, New York who conducted a secondary survey and wrote a summary of her findings called, Daily School Recess Improves Classroom Behavior. Her study found out how often students received recess and for how long. She categorized her information and related recess duration and amounts to improved classroom behavior.