Álvarez-Martínez-Iglesias, José María, Jesús Molina-Saorín, Francisco Javier Trigueros-Cano, and Pedro Miralles-Martínez. “The Development of Historical Competencies in Secondary Education: A Study Based on the Analysis of Sources in Spanish and Italian History Textbooks”. International Journal of Learning, Teaching and Educational Research 20, no. 4 (April 30, 2021): 137–151. Accessed April 29, 2026. http://www.ijlter.net/index.php/ijlter/article/view/120.