1. Adams, Dale W. ?Rural Migration and Agricultural Development in Colombia,?Economic Development and Cultural Change, 17 (1969): 527?539.
2. Blalock, Hubert M.Social Statistics, New York: McGraw-Hill, 1972, Chapter 16.
3. Bradfield, Stillman. ?Selectivity in Rural-Urban Migration: The Case of Huaylas, Peru,? in Aidan Southall and E. M. Bruner (eds.),Urban Anthropology: Cross-Cultural Studies of Urbanization, Oxford University Press, 1973: 351?372.
4. Brown, Lawrence A., and Eric G. Moore. ?The Intraurban Migration Process: A Perspective,?Geografiska Annaler, Series B, 52 (1972): 1?13.
5. Cardona, Ramiro G., and Alan B. Simmons. ?Apuntes Sobre la Llamada ?Crisis? en las Grandes Ciudades,? Vol. 1, Monografías de la Corporación, Centro Regional de Población, Bogotá: December, 1973.