Girsang, Jonggi, 		Hutajulu, Ridwan, 		Hasballah, T., AND 		Parsaoran, Saut.
" KAJIAN OPTIMASI METODE SPSS KEAUSAN PAHAT PERIPHERAL MILLING KERING PADA BAJA AISI 4140" <em>Jurnal Teknologi Mesin UDA</em> [Online], Volume 4 Number 1 (7 June 2023)