Sumartono, Eko, et al. “OPTIMALISASI USAHA PETANI KOPI RAKYAT ETHNIS SELUPU REJANG DIDESA RINDUHATI”. J-Dinamika : Jurnal Pengabdian Masyarakat, vol. 4, no. 1, June 2019, doi:10.25047/j-dinamika.v4i1.1068.