Mang, W.J. et al. 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 (Nov. 2018), 131–135. DOI:https://doi.org/10.14419/ijet.v7i4.35.22341.