Ibrahim, Mohd Mokhzani, Khairul Azhar Jamaludin, Mohd Shafie Rosli, Muhd Ibrahim Muhamad Damanhuri, Hafsah Taha, and Mohamad Termizi Borhan. 2022. “Enhancing Self-Directed Learning Skills via Blended Problem-Based Learning in Chemistry Learning”. CENTRAL ASIA AND THE CAUCASUS 23 (1): 1818-35. https://ca-c.org/CAC/index.php/cac/article/view/253.