Sitepu, B. P. “BELAJAR BERBASIS ANEKA SUMBER DALAM PENDIDIKAN NONFORMAL”. JIV-Jurnal Ilmiah Visi 6, no. 2 (December 30, 2011): 169–179. Accessed April 4, 2025. https://journal.unj.ac.id/unj/index.php/jiv/article/view/7689.