1. Chemistry of Heterocyclic Compounds
2. 1983. “The Merck Index, Encyclopedie of Chemicals, Drugs and Biologicals”. N. J. U. S. A.: Merck and Co., Inc., Rahway. 10th Edition
3. Goodman, L. S. and Gilman, A. 1970. “The Pharmacological Basis of Therapeutics”. London: MacMillan and Co. 4th Edition
4. Infrared spectra of complexes of the thiocyanate and related ions
5. Nakamoto, K. 1970. “Infrared spectra Of Inorganic and Coordination Compounds”. p 187New York: Wiley Interscience.