1. The United States Declaration of Independence;Jefferson,1776
2. Spending on health: A global overview, World Health Organisation, 12 April 2012.
3. Morbidity and Mortality Weekly Report, 1999, 48(29), 621–629.
4. The burden of disease and the changing task of medicine;Jones;N Engl J Med,2012
5. Definition of semiochemical;The Society of American Foresters,2008