WebMD (Cleveland Clinic):
http://www.webmd.com/mental-health/elimination-disorders-encopresis

American Academy of Pediatrics:
http://www.healthychildren.org/English/health-issues/conditions/emotional-problems/Pages/Soiling-Encopresis.aspx

Mayo Clinic:
http://www.medicinenet.com/encopresis/article.htm

Nemours Foundation:

http://kidshealth.org/parent/general/sick/encopresis.html

Columbia University:
http://www.childrensnyp.org/mschony/P01992.html

University of Virginia:

https://med.virginia.edu/pediatrics/about/clinical-and-patient-services/patient-tutorials/chronic-constipation-encopresis/