ปิยะพิพัฒน์ สุธี. “Relationship of Shear Strength with Modulus of Rupture for Soft Clay mixed by Cement and Sand”. Frontiers in Engineering Innovation Research 14, no. 2 (December 30, 2016): 45–54. accessed April 9, 2025. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242013.