Abdulrahman Yusuf Abdullahi, Salisu Muhammad Lawan, Muhammad Sani Gaya, Faiza Ali Umar, Amina Ibrahim, and Muhammad Baballe Ahmad. “Systematic Review of the Literature on Various Soil Classification Methods”. International Journal on Recent Technologies in Mechanical and Electrical Engineering 9, no. 3 (September 30, 2022): 128–135. Accessed October 14, 2024. https://www.ijrmee.org/index.php/ijrmee/article/view/383.