G. I. Harya, M. Mubarokah, S. Widayanti, H. Hariati, R. W. . Inti, and S. D. . Mahiro, “Determinan Permintaan dan Penawaran Kopi Robusta di Indonesia: Analisis Ekonometrik : Determinants of Demand and Supply for Robusta Coffee in Indonesia: Econometric Analysis”, JIMA-EMAGRI, vol. 13, no. 2, pp. 70–82, Jul. 2025.