Siswono, H., Wartono, W., & Koes H, S. (2014). PENGARUH PROBLEM BASED LEARNING BERBANTUAN VIRTUAL LABORATORY TERHADAP KETRAMPILAN PROSES SAINS DAN PENGUASAAN KONSEP SISWA DI SMA. PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL), 3, 22–26. Retrieved from https://journal.unj.ac.id/unj/index.php/prosidingsnf/article/view/5435