Nainggolan, T. H. “CAPITAL CAPABILITY ANALYSIS OF COFFEE BUSINESS (Case Study: Sitolu Bahal Village, Lintongnihuta District, Humbang Hasundutan Regency)”. Agripreneur : Jurnal Pertanian Agribisnis, vol. 9, no. 2, Dec. 2020, pp. 58-65, https://iocscience.org/ejournal/index.php/Agripreneur/article/view/1958.