Laila Nursafitri, Herminarto Sofyan, Ali Muhtadi. Developing Constructivist-Based Blended Learning Model to Increase Critical Thinking Skills. IJAST [Internet]. 2020May1 [cited 2024May3];29(06):4832 -4840. Available from: http://sersc.org/journals/index.php/IJAST/article/view/19407