Mang, Wong Jia, Abdul Ghani Md Rafek, and Goh Thian Lai. 2018. “Issues in Engineering Geological Classification of Weathered Sedimentary Rocks: Case Study of Kati Formation, Parit, Perak”. International Journal of Engineering & Technology 7 (4.35): 131-35. https://doi.org/10.14419/ijet.v7i4.35.22341.