1. United Nations, World Urbanization Prospects, the 2009 Revision, Web Site of the United Nations Population Division.http://www.un.org/esa/population/.
2. Economic models of migration;Åndersson,1982
3. The Spatial Economy;Fujita,1999
4. A dynamic migration theory and its evaluation of concrete systems;Haag;Regional Science and Urban Economics,1986
5. A mathematical theory of migration;Hotelling;Environment and Planning A,1978