Setiyawan, I. A., D. M. Pasaribu, and R. Hikmahtiar. “The Legal Force of Change Order Instruction for the Work in Construction Contracts: A Case Study of Substation Development in Central Sumatra”. SIGn Jurnal Hukum, Vol. 6, no. 2, Feb. 2025, pp. 452-67, doi:10.37276/sjh.v6i2.409.