E. G. Villacreses Sarzoza, L. M. Tituaña Cumbal, J. A. Velasco Delgado, F. V. Salazar Mogro, and J. D. Lama Ruiz, “Gamification and collaborative learning in EFL: effects on communicative competence and academic engagement in education”, Prometeo conoc. cient., vol. 6, no. 2, p. e139, Jul. 2026, doi: 10.55204/pcc.v6i2.e139.