Sánchez Morillas, Carmen María, and Pilar Valero Fernández. “The Use of Proper and Improper Interjections by Students of Spanish As a Foreign Language: Frequencies of Use and Values Reflected in the CAES Corpus”. Didáctica. Lengua y Literatura 34 (April 1, 2022): 137–145. Accessed July 10, 2026. https://revistas.ucm.es/index.php/DIDA/article/view/81360.