Deuanhaksa, Surya, et al. “Determination of Compressive Strength, Flexural Strength, Tensile Strength Concrete Grades 25MPa, 30MPa, 35MPa and 40Mpa: Compressive strength, flexural strength, tensile Strength, Modulus”. Lao Science Journal, vol. 1, no. 1, June 2024, pp. 17-24, https://doi.org/10.71026/ls.2024.01001.