Sierra Macarrón L. Cartularies and Understanding Projects: An Educational Innovation Proposal for Learning about the Evolution of Feudalism in Compulsory Secondary Education. Educación y Futuro [Internet]. 2025 Jan. 13 [cited 2026 Jul. 22];(51):133-61. Available from: https://educacionyfuturo.com/educacionyfuturo/article/view/7650