Dentaly. https://www.dentaly.org/en/malocclusion-crooked-teeth/underbite/#What_causes_an_underbitenbsp
Diakses pada 9 Juli 2019Healthline. https://www.healthline.com/health/underbite
Diakes pada 9 Juli 2019Authority Dental. https://www.authoritydental.org/underbite#causes
Diakses pada 9 Juli 2019