Livescience
https://www.livescience.com/51975-vitamin-a.html
Diakses 19 Juni 2020Healthline
https://www.healthline.com/nutrition/vitamin-a-deficiency-symptoms#section1
Diakses 19 Juni 2020Medline Plus
https://medlineplus.gov/ency/article/002400.htm
Diakses 19 Juni 2020Advance in Skin and Wound Care. https://journals.lww.com/aswcjournal/Fulltext/2011/04000/Checklist_for_Factors_Affecting_Wound_Healing.10.aspx
Diakses pada 19 Juni 2020