APA (7th ed.) Citation

Ir.L.Widarto. (1997). Membuat Biogas. Kanisius.

Chicago Style (17th ed.) Citation

Ir.L.Widarto. Membuat Biogas. Kanisius, 1997.

MLA (8th ed.) Citation

Ir.L.Widarto. Membuat Biogas. Kanisius, 1997.

Warning: These citations may not always be 100% accurate.