Butar-Butar, Erwinson, 		Simbolon, Ronipaian, 		Tarigan, Kristian, AND 		Pardede, Saut.
" RANCANG BANGUN MESIN PENGEROL PIPA BESI" <em>Jurnal Teknologi Mesin UDA</em> [Online], Volume 5 Number 2 (27 December 2024)