1. Albarello, L., Digneffe, F., Hiernaux, P., Maroy, C., Ruquoy, D., & Saint-Georges, P. (1995). Practices and Research Methods in Social Sciences. Gradiva. http://hdl.handle.net/10400.2/7583
2. Ayestarán, J. A. (2012). Tablets vs libros de texto. Unpublished master dissertation. Universidad Pública de Navarra. https://hdl.handle.net/2454/10103
3. Bates, T. (2016). Teaching in a Digital Age: guidelines for designing teaching and learning. https://teachonline.ca/sites/default/files/pdfs/teaching-in-a-digital-age_2016.pdf
4. Pedagogical Models for Distance Education: theoretical assumptions for the construction of learning objects;RENOTE,2007