1. Declaration of the World Summit on Food Security, World Summit on Food Security, Rome, 16–18 November 2009.
2. A. Coleman-Jensen, M. Rabbit, C. Gregory, A. Singh, Household Food Security in the United States in 2014, Economic Research Report No. ERR-194, U.S. Department of Agriculture, Economic Research Service, Washington, DC, 2015.
3. United Nations, Transforming Our World: the 2030 Agenda for Sustainable Development, United Nations, Resolution adopted by the General Assembly on 25 September 2015, 2015.
4. Gallup World Poll, .
5. Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences;Engelhard,2013