1. 2002. ISO (Informasi Spesialite Obat) Indonesia Vol. 36, 293–317. Jakarta, Indonesia: Ikatan Sarjana Farmasi Indonesia.
2. Parfitt , K. 1999. Martindale The Complete Drug Reference, 32nd Ed. 1055–1056. London: Pharmaceutical Press.
3. 2002. British Pharmacopoeia 2002 Vol. 1, 249–240. London: The Stationary Office.
4. 2001. European Pharmacopoeia, 4th Ed. 756–757. Strasbourg, France: Council of Europe.
5. 1997. Pharmacopoeia of The People's Republic of China, English Ed. Vol. II, 75–76. Beijing, China: Chemical Industry Press.