1. Natural dyestuffs in hair cosmetics. In Proceeeding Gülzower Fachgespräche: Färberpflanzen-Forum Färberpflanzen, in Dornburg, Germany, June 4–5;Lenz,1997
2. Natural ingredients for colouring and styling;Dweck;International Journal of Cosmetic Science,2002
3. Henna for hair “How-To” henna;Cartwright-Jones,2006
4. Color chemistry;Zollinger,2003