De Lange, Sarah (December 2005). "Political extremism in Europe". European Political Science. 4 (4): 476–488. doi:10.1057/palgrave.eps.2210056.
Stavrakaki, Yannis; Katsambekis, Giorgos (June 2014). "Left-wing populism in the European periphery: the case of SYRIZA". Journal of Political Ideologies. 19 (2): 119–142. doi:10.1080/13569317.2014.909266.
Stavrakaki, Yannis; Katsambekis, Giorgos (June 2014). "Left-wing populism in the European periphery: the case of SYRIZA". Journal of Political Ideologies. 19 (2): 119–142. doi:10.1080/13569317.2014.909266.