PAWLAK, M., CHENGCHEN, L., ZAWODNIAK, J. and KRUK, M. 2024. Examining predictive effects of general grit and L2 grit on motivated behavior: The mediating effect of self-perceived proficiency . Porta Linguarum An International Journal of Foreign Language Teaching and Learning. IX (Jan. 2024), 93–112. DOI:https://doi.org/10.30827/portalin.viIX.29884.