Siswono, Hendrik, Wartono Wartono, and Supriyono Koes H. 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 (October):22-26. https://journal.unj.ac.id/unj/index.php/prosidingsnf/article/view/5435.