1. https://www.statista.com/statistics/272181/world-pharmaceutical-sales-by-region/.
2. Philippidis, A.http://www.genengnews.com/the-lists/the-top-15-best-selling-drugs-of-2016/77900868.
3. 2015: A New Impact Factor for ACS Chemical Neuroscience and New Topline Data for Global Pharmaceutical Products
4. http://info.evaluategroup.com/rs/607-YGS-364/images/EPV2017Prev.pdf.
5. http://www.imshealth.com/en/about-us/news/top-line-market-data.