Daniel Goodkind; Loraine West; Peter Johnson. A Reassessment of Mortality in North Korea, 1993–2008. Annual meeting of the Population Association of America March 31-April 2, 2011. Washington, D.C. U.S. Census Bureau, Population Division: 3. 28 March 2011 [8 November 2014]. (原始内容存档于2019-09-17).
Daniel Goodkind; Loraine West; Peter Johnson. A Reassessment of Mortality in North Korea, 1993–2008. Annual meeting of the Population Association of America March 31-April 2, 2011. Washington, D.C. U.S. Census Bureau, Population Division: 3. 28 March 2011 [8 November 2014]. (原始内容存档于2019-09-17).