Martín Hidalgo, Irene, Ortiz de Santos, Rosa, Santamaría-Cárdaba, Noelia, and Ortega-Quevedo, Vanessa. 2019. The informal argumentative letter: a didactic sequence of expression and comprehension written in Primary Education. Didáctica. Lengua y Literatura 31, 263–283. DOI:https://doi.org/10.5209/dida.65952