EFEKTIVITAS METODE PROBLEM BASED LEARNING DALAM MERUBAH PERILAKU MEROKOK DI SISWA SMKMUHAMMADIYAH I SURAKARTA. infokes [Internet]. 2015 Dec. 3 [cited 2026 May 6];5(1). Available from: https://www.ojs.udb.ac.id/infokes/article/view/88