Setiawan, Harijanto, Ferianto Raharjo, and Ay Lie Han. “An Innovation Value Chain in Project Based Companies: A Study of Indonesian Contractors”. Civil Engineering Dimension 22, no. 2 (October 6, 2020): 101-108. Accessed April 24, 2024. https://ced.petra.ac.id/index.php/civ/article/view/22997.