Mohd-Yusof, Khairiyah, Syed Ahmad Helmi, Mohammad-Zamry Jamaludin, and Nor-Farida Harun. 2011. “Cooperative Problem-Based Learning (CPBL): A Practical PBL Model for a Typical Course”. International Journal of Emerging Technologies in Learning (iJET) 6 (3):pp. 12-20. https://doi.org/10.3991/ijet.v6i3.1696.