Very Well Health. https://www.verywellhealth.com/causes-of-dark-spots-1069545
Diakses pada 22 April 2019Medical News Today. https://www.medicalnewstoday.com/articles/324833.php
Diakses pada 22 April 2019Healthline. https://www.healthline.com/health/beauty-skin-care/how-to-get-rid-of-dark-spots
Diakses pada 22 April 2019