Joo KP, Andrés C, Shearer R. Promoting distance learners’ cognitive engagement and learning outcomes: Design-based research in the Costa Rican National University of Distance Education. IRRODL [Internet]. 2014 Nov. 14 [cited 2024 Nov. 21];15(6). Available from: https://www.irrodl.org/index.php/irrodl/article/view/1908