Sandí Cruz, M. (2009). Curricular aspects that influence the teaching and learning of english as a foreign language in ninth level students from technical professional high schools in Pérez Zeledón, San José, Costa Rica: Teacher training and materials design. Heredia, CR.: M. Sandí C..

Sandí Cruz, Marianela. Curricular Aspects That Influence the Teaching and Learning of English As a Foreign Language in Ninth Level Students From Technical Professional High Schools in Pérez Zeledón, San José, Costa Rica: Teacher Training and Materials Design. Heredia, CR.: M. Sandí C., 2009.

Sandí Cruz, Marianela. Curricular Aspects That Influence the Teaching and Learning of English As a Foreign Language in Ninth Level Students From Technical Professional High Schools in Pérez Zeledón, San José, Costa Rica: Teacher Training and Materials Design. Heredia, CR.: M. Sandí C., 2009.