Corral-Robles, S., Sánchez-Martín, M., & González-Gijón, G. (2021). Design and validation of a system of categories to assess the written discourse of L2 English learners. Porta Linguarum. An International Journal of Foreign Language Teaching and Learning, (36), 159–174. https://doi.org/10.30827/portalin.vi36.15944