Healthline. https://www.healthline.com/health/different-lip-types-and-how-to-take-care-of-them#lip-care
Diakses pada 29 November 2020Skinkraft. https://skinkraft.com/blogs/articles/types-of-lips
Diakses pada 29 November 2020Insider. https://www.insider.com/the-most-attractive-lip-shape-according-to-science-2018-3
Diakses pada 29 November 2020Research Gate. https://www.researchgate.net/publication/313685971_The_Current_Preferred_Female_Lip_Ratio
Diakses pada 29 November 2020