Pengaruh Zat Aditif Urea terhadap Kuantitas Biodiesel Pada Reaksi Transesterfikasi. Jurnal Kimia Valensi, [S. l.], v. 4, n. 1, 2014. DOI: 10.15408/jkv.v4i1.1049. Disponível em: https://journal.uinjkt.ac.id/index.php/valensi/article/view/1049. Acesso em: 8 jul. 2026.