Álvarez-Martínez-Iglesias, José María, Jesús Molina-Saorín, Francisco Javier Trigueros-Cano, and Pedro Miralles-Martínez. 2021. “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 (4):137-51. http://www.ijlter.net/index.php/ijlter/article/view/120.