Ginsburg, N. (1961) Atlas of Economic Development. Chicago: Univ. of Chicago Press.
2.
Horowitz, I.L. (1967) "Electoral politics, urbanization and social development in Latin America." Urban Affairs Q.2 (March): 3-35. Reprinted in G. H. Beyer (ed.) The Urban Explosion in Latin America. Ithaca: Cornell Univ. Press.
3.
Russett, B.M. et al. (1964 ) World Handbook of Political and Social Indicators. New Haven: Yale Univ. Press.