Basori, I., A. Surocaena, S. Titik Dwiyati, Y. Sari, and B. Singh. “Microstructure and Mechanical Properties Analysis of Quenched and Tempered AISI 4340 Steel”. KnE Social Sciences, Vol. 3, no. 12, Mar. 2019, pp. 675–680, doi:10.18502/kss.v3i12.4139.