Lens, Willy, Lennia Matos, and Maarten Vansteenkiste. 2008. “TEACHERS AS SOURCES OF STUDENTS’ MOTIVATION: ABOUT THE WHAT AND THE WHY OF STUDENT LEARNING”. Revista Digital De Investigación En Docencia Universitaria [Digital Journal of University Teaching Research] 4 (1):9. https://doi.org/10.19083/ridu.4.9.