Seelae Phaisopha และ Sunthorn Pumjan. (2015) The Pre- Feasibility Study of Gold Mine Development, A Case Study of Sepon Deposit, Savannakhet Province, Lao PDR. Chulalongkorn University:ม.ป.ท.Seelae Phaisopha และ Sunthorn Pumjan. 2015. The Pre- Feasibility Study of Gold Mine Development, A Case Study of Sepon Deposit, Savannakhet Province, Lao PDR. ม.ป.ท.:Chulalongkorn University;Seelae Phaisopha และ Sunthorn Pumjan. The Pre- Feasibility Study of Gold Mine Development, A Case Study of Sepon Deposit, Savannakhet Province, Lao PDR. ม.ป.ท.:Chulalongkorn University, 2015. Print.