Martín Hidalgo, I.; Ortiz de Santos, R.; Santamaría-Cárdaba, N.; Ortega-Quevedo, V. The Informal Argumentative Letter: A Didactic Sequence of Expression and Comprehension Written in Primary Education. Didáctica 2019, 31, 263-283. https://doi.org/10.5209/dida.65952.