KHOIRUDIN, R.; BINTORO, D. . Analisis Perdagangan Komoditas Kopi Antara Indonesia Dan 14 Negara Mitra Dengan Pendekatan Model Gravitasi. Perwira Journal of Economics & Business, [S. l.], v. 1, n. 2, p. 18–27, 2021. DOI: 10.54199/pjeb.v1i2.31. Disponível em: https://ejournal.unperba.ac.id/index.php/pjeb/article/view/31. Acesso em: 18 apr. 2024.