Abello, M. M. (2009). Biogas technology solves farm waste disposal problem. Agriculture.
Čikaški stil citiranja (17. izdanje)Abello, Melpha M. "Biogas Technology Solves Farm Waste Disposal Problem." Agriculture 2009.
MLA način citiranja (9. izdanje)Abello, Melpha M. "Biogas Technology Solves Farm Waste Disposal Problem." Agriculture, 2009.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.