1. Clarke, E. G. C. (1969)Isolation and Identification of Drugs. The Pharmaceutical Press, London.
2. Bauer, K. H., andH. Moll, (1967)Die Organische Analyse, 5th Ed. Akademische Verlagsgesellschaft, Leipzig, 557–560.
3. Schoorl, N. (1941)Organische Analyse, deel III, 3rd Ed. NV D.B. Centen's Uitgeversmij., Amsterdam, 105–111
4. Thienes, C. H., andT. J. Haley (1955)Clinical Toxicology, 3rd Ed Lea & Febiger, Philadelphia, chapter XXXV.
5. Mcnally, W. D. (1937)Toxicology, Industrial Medicine, Chicago.