Mokhtar MZ, Tarmizi RA, Ayub AFM, Nawawi MDH. Motivation and Performance in Learning Calculus through Problem-Based Learning. 5007 [Internet]. 2013 Sep. 16 [cited 2024 Nov. 21];3(9):1999-2005. Available from: https://archive.aessweb.com/index.php/5007/article/view/2556