1. Kristensen MB, Bundgaard H, Jensen K (1992) Danish Index of Pharmaceuticals. The Danish Association of Pharmacists, Copenhagen
2. Bundesverband der Pharmazeutischen Industrie e.V. (1988) Rote Liste. Editio Cantor, Aulendorf/Württ
3. Reynolds JEF (1989) Martindale. The Extra Pharmacopoeia. The Pharmaceutical Press, London
4. Moffat AC (1986) Clarke's isolation and identification of drugs. The Pharmaceutical Press, London