Wongpetch, S., and M. Khodpun. “Factor Analysis of Competency Models for Engineers in Local Administrative Organizations Case Study: Nakhon Ratchasima Province”. Journal of Vongchavalitkul university, vol. 38, no. 1, June 2025, pp. 123-45, https://ph01.tci-thaijo.org/index.php/vujournal/article/view/261511.