Ilmiyah, R., W. Wasino, and U. Utomo. “The Development of Local Wisdom-Based Contextual Social Science Teaching Materials With The Theme of Indahnya Kebersamaan (The Beauty of Togetherness) for The Fourth Grade Level of Elementary School”. Journal of Primary Education, Vol. 8, no. 3, Dec. 2018, pp. 291-8, https://journal.unnes.ac.id/sju/jpe/article/view/27622.