↑ Kurian, George Thomas (2011). The encyclopedia of political science. Washington: CQ Press.
↑ Linz, Juan (2000). Totalitarian and authoritarian. Boulder: Lynne Rienne.
↑ Badie, Bertrand, Dirk Berg-Schlosser, and Leonardo Morlino (2011). International encyclopedia of political science. Thousand Oaks, Calif.: SAGE Publications.