Sugiarto, A. ., and R. . Kustiah Ramadania. “Economic and Spatial Regional Integration and Its Impacts on Regional Development in North Tapanuli Regency”. International Journal of Social Science, Education, Communication and Economics (SINOMICS JOURNAL), vol. 2, no. 5, Dec. 2023, pp. 1399-10, doi:10.54443/sj.v2i5.233.