Wardani, Kusuma, et al. “Analisis Pengerasan Surface Spline Flange Gardan KRD (Kereta Rel Diesel) Dengan Metode Quenching Oil”. Majalah Ilmiah Momentum, vol. 17, no. 2, Oct. 2021, pp. 84-88, doi:10.36499/jim.v17i2.5174.