1. World Health Organization. Influenza A (H1N1). Update 39. 2009 May 26 [cited 2009 May 26]. Available from http://www.who.int/csr/don/2009_05_26/en/index.html
2. Brown D. System set up after SARS was slow to alert global authorities. The Washington Post. 2009 Apr 30;A:1 [cited 2009 May 21]. Available from http://www.washingtonpost.com/wp-dyn/content/article/2009/04/29/AR2009042904911.html
3. Gostin L. Fighting the flu with one hand tied. The Washington Post. 2009 May 1 [cited 2009 May 21]. Available from http://www.washingtonpost.com/wp-dyn/content/article/2009/04/30/AR2009043003517.html
4. World Health Organization. International Health Regulations (2005), 2nd ed. Geneva: The Organization; 2008 [cited 2009 May 21]. Available from http://whqlibdoc.who.int/publications/2008/9789241580410_eng.pdf
5. World Health Organization. International Health Regulations (2005), 2nd ed. Annex 2. Geneva: The Organization; 2008 [cited 2009 May 21]. Available from http://whqlibdoc.who.int/publications/2008/9789241580410_eng.pdf. p. 43–46.