Media, Riona Ihsan. 2018. “STUDI PERANCANGAN COMBINATION TOOL AIR VENT NON-CYLINDER DENGAN METODE VDI 2222”. Jurnal Teknik Mesin (Journal Of Mechanical Engineering) 6 (4). Jakarta, Indonesia:237-43. https://doi.org/10.22441/jtm.v6i4.2058.