“PENGARUH PENAMBAHAN UNSUR TEMBAGA PADA PENGECORAN TEKAN BLOK SILINDER BEKAS TERHADAP NILAI IMPAK DAN KEAUSAN : EFFECT OF ADDITION OF COPPER ELEMENTS IN THE COMPRESSION CASTING OF USED CYLINDER BLOCKS ON IMPACT VALUE AND WEAR”, empd, vol. 3, no. 2, hlm. 207–212, Nov 2024, Diakses: 8 Oktober 2025. [Daring]. Tersedia pada: https://journal.unram.ac.id/index.php/empd/article/view/5407