Laksana PK, Suroso A. Cost Estimation Analysis Based on Construction Management, Value Engineering, and Lean Six Sigma for Cost Efficiency Improvement in Coal Transportation Road Projects. Eduvest [Internet]. 2025Jun.12 [cited 2025Jun.20];5(6):6248-62. Available from: http://eduvest.greenvest.co.id/index.php/edv/article/view/50253