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Gaya APA
Handoyo, D.(2018).Panduan Praktis Membuat Biogas Portabel Skala Rumah Tangga dan Industri .Yogyakarta:Andi.
Gaya MLA
Handoyo, Dkk."Panduan Praktis Membuat Biogas Portabel Skala Rumah Tangga dan Industri".Yogyakarta:Andi,2018.Text.