J. M. Álvarez-Martínez-Iglesias, J. Molina-Saorín, F. J. Trigueros-Cano, and P. Miralles-Martínez, “The Development of Historical Competencies in Secondary Education: A Study Based on the Analysis of Sources in Spanish and Italian History Textbooks”, IJLTER, vol. 20, no. 4, pp. 137–151, Apr. 2021.