Ferreras-Listán, M., M. Puig-Gutiérrez, O. Moreno-Fernández, and F. Rodriguez-Marín. “The Relevance of Citizenship, Sustainability and Heritage Education in Early Childhood and Primary Education in Spain”. Pedagogika / Pedagogy, vol. 134, no. 2, Oct. 2019, pp. 61-81, doi:10.15823/p.2019.134.4.