A. Kartika, Trisna Saputri, Reynalda Utari Karo-Karo, Romagiano Machario Sembiring, and Muammar Rinaldi, “The Effect of Investment, Poor Resident, and International Tourists on Gross Regional Domestic Product In North Sumatera in 2001-2020”, OJES, vol. 3, no. 2, pp. 74–79, Sep. 2024, doi: 10.61730/ojes.v3i2.96.