1. Principles of Supply Chain Management;Crandall,2015
2. The United Nationshttp://www.un.org/en/index.html
3. The European Environment Agencyhttps://www.eea.europa.eu/
4. The World Bankhttp://www.worldbank.org/
5. The United Nations Development Programmehttp://hdr.undp.org/en/content/human-development-index-hdi