1. U. Eyuboglu, I. Okaygun, F. Yaras, Dyeing Wool Fibers with Natural Dyes: Practical and Traditional Methods (Ozkur Press, Istanbul, 1983)
2. I. Ozturk, Dyeing Wool with Natural Vegetable Dyes (Dokuz Eylul University Rectorship Press, Izmir, 1999)
3. Research institute for managing sustainability—on behalf of the Austrian Ministry of Agriculture, Environment and Water Management, Plant dyes for textile industry, http://technologies.ew.eea.europa.eu/technologies/industry/F1099059289/plantdyes.pdf/download/. Accessed 06 July 2010
4. D.J. Hill, Rev. Prog. Color. 27, 18 (1997)
5. S.D. Bhattacharya, A.K. Shah, Colourage 46(8), 47 (1999)