YASID, HAMDAN. “ANALISIS USAHATANI DAN PENDAPATAN USAHATANI SEMANGKA DI KECAMATAN KAMPAR KABUPATEN KAMPAR RIAU”. Jurnal Ilmiah Pertanian 1, no. 2 (February 1, 2005): 15–26. Accessed June 12, 2026. https://journal.unilak.ac.id/index.php/jip/article/view/1354.