1. Martindale, in: K. Parfitt (Ed.), The Complete Drug Reference, 32nd ed., Massachusetts, 1999, p. 896.
2. The British Pharmacopoeia, HMSO, London (1993), vol. I and II, London, 1993, p. 978.
3. The United States Pharmacopoea XXIII, The USP Convention, Rockville, 1995, p. 866.
4. The European Pharmacopoeia, Council by Europe, Strasburg, 2001, pp. 1039–1040.
5. Fluorimetric and spectrophotometric determination of labetalol hydrochloride and its tablets;Mohamed;Pharmazie,1993