Lerdwongpaisan A, Chuaykong K, Pookkaman W. Automated Document Management for HVAC product: An Excel VBA Approach. JEIT [internet]. 2026 Feb. 27 [cited 2026 Oct. 7];4(1):29-44. available from: https://ph03.tci-thaijo.org/index.php/JEIT/article/view/4255