Fatoni, Ahmad, Muhfahroyin Muhfahroyin, Agus Sujarwanta, Hening Widowati, and Agus Sutanto. 2020. “The Effectiveness of Coffee Leather Organic Fertilizer on The Productivity of Red Spinach (Amaranthus Tricolor L.) ”. Jurnal Penelitian Pertanian Terapan 20 (3):198-203. https://doi.org/10.25181/jppt.v20i3.1678.