Tasni, Nurfaida, Andika Saputra, and Ovan Adohar. “Students’ Difficulties in Productive Connective Thinking to Solve Mathematical Problems”. Beta: Jurnal Tadris Matematika 13, no. 1 (May 30, 2020): 33-48. Accessed October 28, 2020. https://jurnalbeta.ac.id/index.php/betaJTM/article/view/371.