“Study of Palm Plant Productivity (Arenga pinnata merr.) Based on Differences in Companion Plants: Kajian Produktivitas Tanaman Aren ( Arenga pinnata merr. ) Berdasarkan Perbedaan Tanaman Pendamping” (2021) Jurnal Online PERTANIAN TROPIK, 8(3), pp. 228-233. doi: 10.32734/jpt.v8i3.9176.