Sukonwiriyakul , Thadapanitsadee, and Jintavee Klaisang. 2020. “Learning Design of Cloud Based Mobile Learning With 4Ex2 Model on Mathematical Problem Solving Ability”. An Online Journal of Education 15 (2):OJED1502003a (15 pages). https://so01.tci-thaijo.org/index.php/OJED/article/view/245393.