Self. https://www.self.com/story/how-to-wash-your-face
Diakses 7 Januari 2020Well and Good. https://www.wellandgood.com/good-looks/wash-face-with-cold-water/
Diakses 7 Januari 2020Bustle. https://www.bustle.com/articles/157964-i-tried-the-ice-water-facial-this-is-what-happened-photos
Diakses 7 Januari 2020Healthline.https://www.healthline.com/health/cold-shower-vs-hot-shower#Whats-so-great-about-cold-showers?
Diakses 11 Agustus 2020