Cleveland Clinic. https://my.clevelandclinic.org/health/articles/11014-pigmentation-abnormal-pigmentation#
Diakses pada 25 November 2020Johns Hopkins Medicine. https://www.hopkinsmedicine.org/health/conditions-and-diseases/skin-pigment-disorders
Diakses pada 25 November 2020Medline Plus. https://medlineplus.gov/skinpigmentationdisorders.html
Diakses pada 25 November 2020