Zachariasz, Robert. “Perbedaan Pengetahuan Ibu-Ibu Tentang Isu-Isu Lingkungan Antara Strategi Penyuluhan Out Group Versus in Group Berdasarkan Kepedulian Lingkungan”. IJEEM - Indonesian Journal of Environmental Education and Management 1, no. 2 (September 2, 2017): 27 - 44. Accessed July 4, 2025. http://103.8.12.212:33180/unj/index.php/ijeem/article/view/3705.