Smith K. Positive Reinforcement….a proactive intervention for the classroom. Institute on Community Integration, College of Education, University of Minneapolis. http://www.cehd.umn.edu/ceed/publications/tipsheets/preschoolbehavior/posrein.pdf. Accessed 12/13/15.
Positive Reinforcement. University of Kansas. http://www.specialconnections.ku.edu/?q=behavior_plans/classroom_and_group_support/teacher_tools/positive_reinforcement. Accessed May 2016.