Pisith Mao และ Pipat Laowattanabandit. (2015) Optimization of Pillar Design for Potash Deposits of Khorat Basin, Northeast Thailand. Chulalongkorn University:ม.ป.ท.Pisith Mao และ Pipat Laowattanabandit. 2015. Optimization of Pillar Design for Potash Deposits of Khorat Basin, Northeast Thailand. ม.ป.ท.:Chulalongkorn University;Pisith Mao และ Pipat Laowattanabandit. Optimization of Pillar Design for Potash Deposits of Khorat Basin, Northeast Thailand. ม.ป.ท.:Chulalongkorn University, 2015. Print.