Mairizal, and Agus Taufik. “Relationship Model of Competitiveness and Productivity of Engineering Procurement and Construction for Indonesia Construction Industry”. International Journal of Sustainable Construction Engineering and Technology, vol. 14, no. 2, May 2023, pp. 96-104, https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/13979.