Costa-jussà, Marta R.; Formiga, L.; Torrillas, O.; Petit, J.; Fonollosa, José A. R. International review of research in open and distance learning Vol. 16, num. 6, p. 174-205 DOI: 10.19173/irrodl.v16i6.2145 Date of publication: 2015-11-01 Journal article