Wijaya, Arie, Johny Soedarsono, and Aldi Laksana. 2021. “The Study of Mixing Purple Sweet Potato and Turmeric Extract As Green Corrosion Inhibitor for API-5L in NaCl 3,5% Environment”. Jurnal Pendidikan Teknologi Kejuruan 4 (4), 140-45. https://doi.org/10.24036/jptk.v4i4.21823.