Keopasird, Vizian, and Tanakrit Thurisut. “GUIDELINES FOR THE DEVELOPMENT OF SOIL LEAF ISSUING SERVICES FOR THE PEOPLE OF THE DEPARTMENT OF NATURAL RESOURCES AND ENVIRONMENT VIENTIANE PREFECTURE LAO PEOPLE’S DEMOCRATIC REPUBLIC”. Journal of MCU Nakhondhat 8, no. 4 (April 24, 2021): 316–329. Accessed March 28, 2024. https://so03.tci-thaijo.org/index.php/JMND/article/view/251654.