1. “Carmine, cochineal and kermes carmine [pigments]”;Schweppe;Artists. Pigm.,1986
2. The fine cochinial insect of Nopal, Mexican dye for the world;de la Cruz Hernandez-Hernandez;Ciencia (Mexico City),2005
3. “Kermes Dye III”;Dimroth;Liebigs Ann. Chem.,1916
4. “C-Glycosyl Compounds. Part III, Carminic Acid.”;Ali;J. Chem. Soc.,1959
5. “The position of the carboxyl group in Carminic acid”;Bhatia;Indian J. Chem.,1965