1. “Advanced Inorganic Chemistry”, 4th ed.;Cotton,1980
2. “CTFA International Color Handbook”;Pakenham,1985
3. “Dana's Manual of Mineralogy”, 15th ed.;Hurlbut,1949
4. “Kirk-Othmer Encyclopedia of Chemical Technology”,1983
5. “Martindale: The Extra Pharmacopoeia”, 27th ed.;Wade,1977