Kay, Evelyn Reis Ecker. Summaries of Manpower Surveys and Reports for Developing Countries, 1958-68 : Bulletin of the United States Bureau of Labor Statistics, No. 1628 , Washington, D.C: U.S. Dept. of Labor Bureau of Labor Statistics, June 1969, https://fraser.stlouisfed.org/title/4849, accessed on November 5, 2024.