Sorto, M. Alejandra, Jeffery H. Marshall, Thomas F. Luschei, and Martin Carnoy. 2009. “TEACHER KNOWLEDGE AND TEACHING IN PANAMA AND COSTA RICA: A COMPARATIVE STUDY IN PRIMARY AND SECONDARY EDUCATION ”. Revista Latinoamericana De Investigación En Matemática Educativa 12 (2): 251-90. https://www.relime.org/index.php/relime/article/view/337.