1. Polio this week as of 30 May 2015. Available at: http://www.polioeradication.org/Dataandmonitoring/Poliothisweek.aspx. Accessed 30 May 2015.
2. Interrupting poliovirus transmission – New solutions to an old problem
3. Polio in Pakistan's North Waziristan
4. UN fears spread of polio as 500,000 flee North Waziristan. Available at: http://tribune.com.pk/story/726404/un-fears-spread-of-polio-as-500000-flee-n-waziristan/. Accessed 5 June 2015.
5. Pakistan polio outbreak “will probably be fixed next year.” Available at: http://www.theguardian.com/global-development/2014/nov/25/pakistan-polio-outbreak-world-health-organisation. Accessed 5 June 2015.