คำพุฒ ประชุม, and ไพฑูรย์ พชรพงศ์. “Requirement of the Organizations in Qualification for Civil Engineering”. Journal of Engineering, RMUTT 4 (December 30, 2003): 45–53. Accessed April 29, 2024. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242337.