Wijaya, A., Soedarsono, J., & Laksana, A. (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), 140-145. https://doi.org/10.24036/jptk.v4i4.21823