1. 1. The European Cosmetic Toiletry and Perfumery Association (COLIPA) . SPF test method. May, 1994.
2. 3. Cosmetic Toiletry & Fragrance Association of South Africa (CTFA-SA), the European Cosmetic Toiletry and Perfumery Association (COLIPA) and Japan Cosmetic Industry Association (JCIA): International Sun protection Factor (SPF) test method. 2003.
3. 5. Deutsches Institut fur Normung e.V.(DIN). Experimental evaluation of the protection from erythema by external sunscreen products for the human skin. DIN 67501. Berlin, Germany, 1999.