1. Martindale, the Complete Drug Reference,1999
2. The British Pharmacopoeia, The Pharmaceutical Press, London, 2000, pp. 768–770.
3. The United States Pharmacopoeia, The United States Pharmacopeial Convention, Rockville, MD, 2001, pp. 941–947.
4. Normal-Phase TLC Separation of Enantiomers of 1.4-Dihydropyridine Derivatives