“OPBL Learning Model on Problem Solving Ability in Basic Programming Subjects in Vocational High Schools: Model Pembelajaran OPBL Terhadap Kemampuan Pemecahan Masalah Pada Mata Pelajaran Pemrograman Dasar di Sekolah Menengah Kejuruan” (2023) Indonesian Journal of Education Methods Development, 18(1), p. 10.21070/ijemd.v21i.726. doi:10.21070/ijemd.v21i.726.