Md. Yusof, Zeety, et al. “Permeability of the Treated Peat Soil Mixtures With Pond Ash – Hydrated Lime”. International Journal of Engineering & Technology, vol. 8, no. 1.9, Jan. 2019, pp. 74-76, https://doi.org/10.14419/ijet.v8i1.9.26371.