Pignataro, Adrián, and María José Cascante. “PRESIDENTIAL APPROVAL IN COSTA RICA: EXPLAINING TYPICAL AND UNUSUAL PATTERNS”. Revista Latinoamericana de Opinión Pública 8, no. 2 (November 1, 2019): 125–156. Accessed May 25, 2022. https://revistas.usal.es/index.php/1852-9003/article/view/rlop.22356.