1. Azo Dyes, 3. Direct (Substantive) Dyes;Ullmann's Encyclopedia of Industrial Chemistry;2018-05-25
2. Azo Dyes, 3. Direct (Substantive) Dyes;Ullmann's Encyclopedia of Industrial Chemistry;2011-10-15
3. Direct dyes;Handbook of Textile and Industrial Dyeing;2011
4. Azo Dyes;Ullmann's Encyclopedia of Industrial Chemistry;2000-09-15
5. The Chromatographic Behavior of some Hydrophilic Dyes and Dye Intermediates on Thin Layers of Strong and Weak Ion Exchangers;Journal of Liquid Chromatography;1989-05