Flat feet and fallen arches. healthychildren.org. American Academy of Pediatrics. http://www.healthychildren.org/English/health-issues/conditions/orthopedic/pages/Flat-Feet-Fallen-Arches.aspx. Updated November 21, 2015. Accessed April 1, 2016.
Flexible flatfoot in children. American Academy of Orthopedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=a00046. Updated March 2013. Accessed April 2016.