Lähteet:
1. "ectropion ja entropium" Dr. Rob Hicks, BBC Health (online) - http: //www.bbc.co.uk/health/conditions/entropion1.shtml#top
2. "silmäsairauksien /Silmäluomen olosuhteet," entropium /ectropion ", selkeys Eye Group (online) - http: //www.clarityeyegroup.com/html/eye-conditions.html
3. silmäsairauksien, "ectropion", on StLukesEye.com - https://www.stlukeseye.com/conditions/Ectropion.asp
4.
"entropium", Medline Plus Lääketieteellinen Encyclopedia (online) - https://www.nlm.nih.gov/medlineplus/ency/article/001008.htm
5. "kasvojen halvaus ", on HealthCentral.com - https://www.healthcentral.com/ency/408/003028.html