Laura Butarbutar Y, Violita Sitorus N. ANALISIS TATA NIAGA BIJI KOPI ROBUSTA DI KABUPATEN DAIRI. akrabjuara [Internet]. 2019 Feb. 5 [cited 2026 Jan. 22];4(1):176-90. Available from: https://akrabjuara.com/index.php/akrabjuara/article/view/449