na INLIS000000000014278 20150706163546 170126||||||||| | ||| |||| || || 979-497-823-X 0010-071500000014278 665.77 665.77 WID m WIDARTO membuat Biogas Cetakan : 9 yogyakarta Kanisius 2006 44 hlm. 19 cm. Bibliografi : hlm.44 BIOGAS SUDARTO