Purba, Rosmadelina, Irawaty Rosaline, Ringkop Situmeang, Christin Imelda Girsang, and Wahyunita Sitinjak. “Growth Response and Production of Cabbage (Brassica Olera Var. Capitata) on Various Kinds of NPK and Organic Fertilizers ”. Jurnal Penelitian Pendidikan IPA 9, no. 7 (July 25, 2023): 5516–5523. Accessed November 25, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/3666.