Overview of waves of democracy in the world history

• GRUGEL, Jean. Democratization: a critical introduction. New York, N.Y.: Palgrave, 2002, chap. 2 (15 pages)
  
• HUNTINGTON, Samuel P. The third wave: democratization in the late twentieth century. Norman: University of Oklahoma Press, 1991, pp. 13-26 (14 pages)
  
• ABUSHOUK, Ahmed I. “The Arab Spring: A Fourth Wave of Democratization?” DOMES: Digest of Middle East Studies 25, no. 1 (March 2016): 52–69. doi:10.1111/dome.12080, pp. 52-69 (18 pages)
  

Total 47 pages.