1. “Protecting your skin: the history of sunscreen.” Random
History.com
. 28 April 2009.
http://www.randomhistory.com/2009/04/28_sunscreen.html
2. “Piz Buin: An inspiring brand image.” Piz
Buin.com
. 14 April 2012.
http://www.pizbuin.com/us/our-brand/our-heritage
3. Afaq F, Katiyar SK. Polyphenols: skin photoprotection and inhibition of photocarcinogenesis. Mini-Rev Med Chem. 2011;11:1200–15.
4. Bhatia N, Berman B, Ceilley RI, Kircik LH. Understanding the role of photolyases: photoprotection and beyond. J Drugs Dermatol. 2017;16(5 Suppl):s61–6.
5. US Food and Drug Administration (FDA). 21 CFR 201.327. FDA-1978-N-0018-0698. Labeling and effectiveness testing; sunscreen drug products for over-the-counter human use. Final rule Fed Regist. 2011;76:35620–65..
https://www.govinfo.gov/content/pkg/FR-2011-06-17/pdf/2011-14766.pdf