Pongmungpak, Pondchai, Tanawat Pimoljinda, and Rittikron Siripraserdchok. 2015. “Change Management and Operational Efficiency of Plant Contractors in the Amata Nakorn Industrial Estate, Chonburi Province”. Ratchaphruek Journal 13 (1):103-9. https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/240955.