Liu, Ben-chieh (1 January 1975). "Differential Net Migration Rates and the Quality of Life". The Review of Economics and Statistics. 57 (3): 329–337. doi:10.2307/1923917. JSTOR1923917.
Liu, Ben-chieh (1 January 1975). "Differential Net Migration Rates and the Quality of Life". The Review of Economics and Statistics. 57 (3): 329–337. doi:10.2307/1923917. JSTOR1923917.
Weeks, John Robert (1 January 2015). Population : an introduction to concepts and issues (Twelfth ed.). Boston, MA. ISBN9781305094505. OCLC884617656.{{cite book}}: CS1 maint: location missing publisher (link)
Weeks, John Robert (1 January 2015). Population : an introduction to concepts and issues (Twelfth ed.). Boston, MA. ISBN9781305094505. OCLC884617656.{{cite book}}: CS1 maint: location missing publisher (link)