Md. Yasin, Md. Aris Safree bin, Mohd. Najmi bin Daud, Haryati bt. Musa, and Syed Sohail Imam. “ffect of eaningfulness of earning eterials on peed of earning”. The Journal of Behavioral Science 3, no. 1 (1): 26-30. ccessed November 27, 2021. https://so06.tci-thaijo.org/index.php/IJBS/article/view/2160.