phongsajiraangkul, napaphat, and Amornwan Rangkoon. 2021. “Approaches to Increasing the Efficiency of Personnel Working in the New Normal Era : A Case Study of Maintenance Division, Operation and Maintenance Department Provincial Electricity Authority Area 1 (Northeastern)”. Journal of Modern Learning Development 7 (1):301-12. https://so06.tci-thaijo.org/index.php/jomld/article/view/251742.