Kerguelén-Mendez, Ana Rocío, and Frecya Isabel Henao-Cabrales. 2012. “A Study of Private High School Teachers’ Optimism of Monteria City”. Informes Psicológicos 12 (2): 55-68. https://revistas.upb.edu.co/index.php/informespsicologicos/article/view/1509.