Gargazi, Gargazi, et al. “Identifikasi Karakter Biodisel Minyak Jelantah Menggunakan Instrumen Gas Cromatografi Mass Spectroscopy (GC-MS)”. Empiricism Journal, vol. 3, no. 2, Dec. 2022, pp. 333-40, https://doi.org/10.36312/ej.v3i2.1083.