Yanto, Puji, 		Suwignyo, Joko, AND 		Fatra, Fahmy.
" UJI PERFORMA DAN EMISI GAS BUANG MOTOR INJEKSI 4 TAK MENGGUNAKAN VARIASI ROLLER DAN BUSI" <em>Journal of Vocational Education and Automotive Technology</em> [Online], Volume 4 Number 2 (28 December 2022)