1. Indigo;Balfour-Paul,1998
2. Dyes and Fleece Types in Prehistoric Textiles from Scandinavia and Germany;Bender Jorgensen;Journal of Danish Archaeology,1986
3. Natural Dyes – Sources, Tradition, Technology, Science;Cardon,2007
4. Dyes analyses of selected textiles from Maximianon, Krokodilô and Didymoi (Egypt);Cardon,2004
5. Photo-oxidation products of quercetin and morin as markers for the characterisation of natural flavonoid yellow dyes in ancient textiles;Ferreira,2002