ปัญญารัตนะ ศุภกิจ, and ระโหฐาน จิราพร. 2019. “Motivation Factors Affecting Work Efficiency of Thai Employees in the Automotive Plastic Parts Industry, WHA Eastern Seaboard 1 Industrial Estate Rayong Province”. Journal of Graduate Research 10 (1):189-203. https://so02.tci-thaijo.org/index.php/banditvijai/article/view/176817.