Subroto, Gatot, AND 		Soejono, Djoko.
" Utilization Arabica Skin Waste of Coffee as a Basic Material  for Making Bioethanol in Sukorejo Village, Sumber Wringin District Bondowoso Regency" <em>Warta Pengabdian</em> [Online], Volume 16 Number 1 (15 March 2022)