See O. Fals-Borda, Subversion and Social Change in Colombia (rev. ed., tr. 1969); A. E. Havens and W. L. Flinn, Internal Colonialism and Structural Change in Colombia (1970); T. E. Weil et al., Area Handbook for Colombia (1970); J. M. Henao and G. Arruba, History of Colombia (tr. 2 vol., 1938; repr. 1976); J. B. Sokol et al., Colombia: Economic Development and Policy under Changing Conditions (1984); R. H. Dix, The Politics of Colombia (1986); J. Hartlyn, The Politics of Coalition Rule in Colombia (1988); B. Bagley et al., The State and Society in Colombia (1988).