Suhartana, I Putu Gde, 		Setiyo, MP, Dr. Ir Yohanes, AND 		Widia, MSIE, Dr. Ir. I Wayan.
" Kajian Proses Fermentasi Sludge Kotoran Sapi" <em>Jurnal BETA (Biosistem dan Teknik Pertanian)</em> [Online], Volume 5 Number 1 (15 January 2017)