Susiati, Devi, et al. “PEMBELAJARAN MESIN BUBUT ULIR SISWA SMK BUBUTAN SURABAYA PENDEKATAN PROBLEM BASED LEARNING”. Community Development Journal : Jurnal Pengabdian Masyarakat, vol. 4, no. 4, Oct. 2023, pp. 8428-33, doi:10.31004/cdj.v4i4.18461.