Chairoj Rattanakawin และ Aung Lay Tin. (2019) Hardgrove grindability index and approximate work index of sodium feldspar. <i>Songklanakarin Journal of Science and Technology</i>, <i>41</i>(3), 664-668.Chairoj Rattanakawin และ Aung Lay Tin. "Hardgrove grindability index and approximate work index of sodium feldspar". Songklanakarin Journal of Science and Technology 41 (2019):664-668.Chairoj Rattanakawin และ Aung Lay Tin. Hardgrove grindability index and approximate work index of sodium feldspar. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2019.