Revenga Sánchez, Miguel. “Five Major Challenges (and Just As Many Threats) for Constitutional Democracy in the 21st Century”. Revista Anuario Parlamento y Constitución, no. 12 (December 31, 2009): 25–44. Accessed November 9, 2026. https://parlamentoyconstitucion.cortesclm.es/rapc/article/view/199.