เปรมปรีดิ์ ป. “POLICY IN FORMATION PROCESS GUIDELINES ON PROTASH SURVEYING IN SAKONNAKHON PROVINCE”. Journal of MCU Social Science Review, vol. 7, no. 1, Feb. 2019, pp. 185-9, https://so03.tci-thaijo.org/index.php/jssr/article/view/235563.