1.
Jamil MS, Mohamad Japeri AZUS, Abu Bakar AA, Muhammad Ali KA, Ahmat H. Identification of Source Contributions to Air Pollution in Penang Using Factor Analysis. IJIE. 2019;11(8):221-228. Accessed April 7, 2026. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/2472