Juwita, Arifin Maksum,. “ANALISIS KUALITAS BUKU PELAJARAN IPS SD”. Perspektif Ilmu Pendidikan 30, no. 1 (April 16, 2016): 41 - 46. Accessed August 23, 2019. http://journal.unj.ac.id/unj/index.php/pip/article/view/2621.