B. Samosir, “Improving Student Learning Outcomes with the Application of Problem Based Learning Models in Microprocessor and Microcontroller Subjects at SMK Negeri 2 Pematangsiantar”, Int. J. Multidiscip. Appl. Bus. Edu. Res., vol. 3, no. 7, pp. 1284–1294, Jul. 2022, doi: 10.11594/ijmaber.03.07.08.