et. al., Mohammad Ichsan,. “The Mediating Effect of Strategic Purchasing in Pre-Stressed Concrete Based Construction Project: A Case Study of Construction Contractor in Indonesia”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 10 (April 28, 2021): 6728 –. Accessed October 15, 2024. https://turcomat.org/index.php/turkbilmat/article/view/5539.