LUBIS, D. .-. THE STUDY ON THE INCOME AND PURCHASING POWER OF NORTH SUMATERA PROVINCE. Advances in Social Sciences Research Journal, [S. l.], v. 5, n. 11, 2018. DOI: 10.14738/assrj.511.5205. Disponível em: https://journals.scholarpublishing.org/index.php/ASSRJ/article/view/5205. Acesso em: 2 may. 2024.