Kong R, Cui Y, Fisher GJ, Wang X, Chen Y, Schneider LM, Majmudar G (March 2016). "A comparative study of the effects of retinol and retinoic acid on histological, molecular, and clinical properties of human skin". Journal of Cosmetic Dermatology. 15 (1): 49–57. doi:10.1111/jocd.12193. PMID26578346.
drugs.com
"Vitamin A". The American Society of Health-System Pharmacists. Diarsipkan dari versi asli tanggal 30 December 2016. Diakses tanggal 8 December 2016.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
handle.net
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World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
Kong R, Cui Y, Fisher GJ, Wang X, Chen Y, Schneider LM, Majmudar G (March 2016). "A comparative study of the effects of retinol and retinoic acid on histological, molecular, and clinical properties of human skin". Journal of Cosmetic Dermatology. 15 (1): 49–57. doi:10.1111/jocd.12193. PMID26578346.
"Vitamin A". The American Society of Health-System Pharmacists. Diarsipkan dari versi asli tanggal 30 December 2016. Diakses tanggal 8 December 2016.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)