Darmo, Budi. 2014. “PENGARUH PROBLEM BASE LEARNING (PBL) DAN SIKAP ILMIAH TERHADAP HASIL BELAJAR FISIKA SISWA SMA”. Joint Prosiding IPS Dan Seminar Nasional Fisika 3 (October):239-42. https://journal.unj.ac.id/unj/index.php/prosidingsnf/article/view/5514.