Syarifudin, S.; Fatkhurrozak, F.; Sanjaya, F. L.; Ardiyanto, R.; Yohana, E. Strengthening Class XII Competence for Covid-19 Products Through the Ignition Combustion Injection System Workshop: Penguatan Kompetensi Kelas XII Produk Covid-19 Melalui Workshop Sistem Injeksi Ignition Cumbution. DJPKM 2023, 7, 147-155.