Pacella, B. L. (n.d.). Limit setting / discipline. Retrieved from http://www.theparentchildcenter.org/parenting-articles/limit-setting-discipline
Poarch, J.E. (1990). Limits: The keystone of emotional growth. Muncie, IN: Accelerated Development Inc.
Runkel, H. E. (2008). Screamfree parenting: The revolutionary approach to raising your kids by keeping your cool. New York, NY: Broadway Books