Solovieva, Y., D. Rosas Alvarez, and L. Quintanar. “Teaching of Grammar Categories: An Approach According to Activity Theory”. Perspectives of Arts and Social Studies Vol. 1 (June 15, 2019): 81-101a. Accessed June 19, 2026. https://stm1.bookpi.org/index.php/pass-v1/article/view/90.