Laksana, Priyogi Karta, and Agus Suroso. “Cost Estimation Analysis Based on Construction Management, Value Engineering, and Lean Six Sigma for Cost Efficiency Improvement in Coal Transportation Road Projects”. Eduvest - Journal of Universal Studies 5, no. 6 (June 12, 2025): 6248–6262. Accessed June 20, 2025. http://eduvest.greenvest.co.id/index.php/edv/article/view/50253.