Tatiyaporn Khotthanoo, Narumon Changsri, Maitree Inprasitha. A Development of Mathematics Lesson by Using Dbook Pro. IJAST [Internet]. 2020Jun.1 [cited 2024May4];29(11s):566 -570. Available from: http://sersc.org/journals/index.php/IJAST/article/view/20020