Warjanto, Setyo, et al. “EFEKTIFITAS SOCIAL LEARNING NETWORK BERBASIS EDMODO TERHADAP HASIL BELAJAR SISWA SMA PADA MATERI ALAT OPTIK”. Joint Prosiding IPS Dan Seminar Nasional Fisika, vol. 3, Oct. 2014, pp. 148-50, https://journal.unj.ac.id/unj/index.php/prosidingsnf/article/view/5497.