Thongthip บุญเรือน. 2020. “MODERN PERSONNEL MANAGEMENT: A CASE STUDY OF RANGER INVESTIGATION SECURITY COMPANY LIMITED”. Journal of MCU Nakhondhat 7 (8). Nakhon Si Thammarat, Thailand:158-73. https://so03.tci-thaijo.org/index.php/JMND/article/view/246249.