Liew TW, Zin NAM, Sahari N, Tan S-M. The Effects of a Pedagogical Agent’s Smiling Expression on the Learner’s Emotions and Motivation in a Virtual Learning Environment. IRRODL [Internet]. 2016 Sep. 26 [cited 2024 Apr. 20];17(5). Available from: https://www.irrodl.org/index.php/irrodl/article/view/2350