Andhita, Krisna, and Rahmania Sri Untari. “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”. Indonesian Journal of Education Methods Development, vol. 18, no. 1, Feb. 2023, p. 10.21070/ijemd.v21i.726, doi:10.21070/ijemd.v21i.726.