Ożańska-Ponikwia, K. et al. 2019. L2 Gain or L2 Pain? A Comparative Case Study of the Target Language Development among the Erasmus+ Mobility Students and At-Home Students. Theory and Practice of Second Language Acquisition. 5, 1 (Jun. 2019), 73–92. DOI:https://doi.org/10.31261/TAPSLA.2019.05.05.