Heru Budi Utomo, Slamet Prawiro Harto, Amat Jaedun. “Development and Validation of Instruments to Measure the Competence of Road Engineering Experts”. International Journal of Advanced Science and Technology 29, no. 3 (April 8, 2020): 8059 - 8064. Accessed July 25, 2024. https://sersc.org/journals/index.php/IJAST/article/view/8375.