Lantolf, James P., Lindsey Kurtz, and Olesya Kisselev. “Understanding the Revolutionary Character of L2 Development in the ZPD: Why Levels of Mediation Matter”. Language and Sociocultural Theory 3, no. 2 (March 14, 2017): 153–171. Accessed July 16, 2024. https://journal.equinoxpub.com/LST/article/view/608.