Purba JS, Sianturi T, Siahaan S. Pengadaan Mesin Pengering Biji Kopi Tipe Drum Rotary Di Desa Buttu Bartong Lama Kecamatan Raya Kabupaten Simalungun. JPkMN [Internet]. 2024Jul.16 [cited 2025Dec.31];5(3):3224-32. Available from: http://ejournal.sisfokomtek.org/index.php/jpkm/article/view/3388