Wibowo, Nandar Saliro, and Nurato Nurato. 2018. “Analisis Pengaruh Ketidakstabilan Temperatur Terhadap Hasil Kekerasan Meterial Dari Proses Heat Treatment Piston”. Jurnal Teknik Mesin (Journal Of Mechanical Engineering) 7 (3). Jakarta, Indonesia:138-48. https://doi.org/10.22441/jtm.v7i3.4520.