Panjaitan, J., F. Firdaus, and D. Dasrol. “Praktik Penetapan Harga Pada Kegiatan Jual Beli Gabah Di Kecamatan Silaen Kabupaten Toba”. Jurnal Ilmiah Wahana Pendidikan, Vol. 11, no. 10.B, Sept. 2025, pp. 83-10, https://jurnal.peneliti.net/index.php/JIWP/article/view/13011.