Abu Bakar, Aishah, and Nur Afifah Fatinnisa’ Rizal Imran. “Standard Penetration Test in Malaysia: Safety Issues and Improvement Opportunities”. CONSTRUCTION 3, no. 2 (December 22, 2023): 263–274. Accessed November 21, 2024. https://journal.ump.edu.my/construction/article/view/9423.