Pebriari NKS, Margunayasa IG, Kusmariyatni NN. Development of Collaborative Learning Devices on Two-Dimentional Figure Topic of Mathematics for 4th Students. jipd [Internet]. 2019 Nov. 30 [cited 2024 Nov. 5];5(1):17-24. Available from: https://journal.uhamka.ac.id/index.php/jipd/article/view/8664