1. The internet drug index;Ziac, http://www.rxlist.com/ziac-drug.htm.
2. Drug Bank; Bisoprolol; http://www.drugbank.ca/drugs/DB00612.
3. Drug Bank; Hydrochlorothiazide; http://www.drugbank.ca/drugs/DB00612.
4. Ramakrishna, S. (2013) The United States Pharmacopoeia 36 National Formulary; The United States Pharmacopoeia Convention, Inc: Rockville, MD. 31, 2679.
5. European Pharmacopoeia seventh edition, supplement 7.4 page 4321, Directorate for the quality of medicines and healthcare of the council of Europe; European Pharmacopoeia seventh edition, supplement 7.4 page 4321.