1. Statistics Indonesia, “Gross Regional Domestic Product of Provinces in Indonesia by Industry,” Statistics Indonesia, 2021.
2. Ministry of Public Works and Public Housing, “Synchronization of Short-Term Development Programs and Financing 2018-2020 – Integration of Regional Development with Public Works Infrastructure and Public Housing of Sumatera Island,” Regional Infrastructure Development Agency, 2018.
3. Ministry of Public Works and Public Housing, “Rencana Pembangunan Jalan Tol Trans Sumatera,” Indonesian Toll Road Authority, 2018.
4. Indonesian Toll Road Authority, “Trans Sumatera Toll Road Has Operated For 653 Km,” Indonesian Toll Road Authority News, 2021.
5. Producing Alternative Concept for the Trans-sumatera Toll Road Project Development using Location Quotient Method