5BOGUE D J.Internal Migration[M]//HAUSER P M, DUNCAN O D. The Study of Population: An Inventmy and Appraisal. Chicago: University of Chicago Press, 1955: 486-509.
6LEWIS W A. Economic development with unlimited supplies of labor [J]. The Manchester Sehool of Economic and Scmial Studies, 1954, 22 (2): 139-191.
7TODARO M P. Internal Migration in Developing Countries: A Review of Theory, Evidence, Methodology and ResearchPriorities[M]. Geneva: International Laahr Office, 1976: 1-30.
8STARKO, BLOOM D E. The new evonomic of labor migration [J]. American Economic Review, 1985, 75: 173-178.