1. Sunscreens: Development, Evaluation, and Regulatory Aspects;Lowe,1997
2. European Commission. Council Directive 76/768/EEC of 27 July 1976 and its successive amendments (http://europa.eu.int/eur-lex/en/lif/reg/en_ergister_133016.html).
3. Japanese Standard of Cosmetic Ingredients, Yakuji Nippo Ltd., Tokyo, Japan, 1985.
4. US Food and Drug Administration, Department of Health and Human Services, 21CFR, Parts 310, 352, 700 and 740, RIN 0910-AA01, Fed. Register Rules Regs. 64 (1999) 27666.
5. National Toxicology Program (http://ntp.niehs.nih.gov/).