1. Access to Essential Medicines,2004
2. How to Develop and Implement: A National Drug Policy,2001
3. https://www.middleeastmonitor.com/20191011-un-yemen-set-to-become-poorest-country-in-the-world/
4. https://www.ye.undp.org/content/yemen/en/home/countryinfo.html
5. https://www.history.com/topics/middle-east/arab-spring