Mónge-Nájera, J., V. H. Méndez-Estrada, and A. Villalobos Rodríguez. “Effect of the Typography and Paragraph Presentation of Printed Textbooks, on Distance Learning in Adults”. UNED Research Journal, vol. 1, no. 1, June 2009, pp. 43-68, doi:10.22458/urj.v1i1.234.