Yeni Noviana, Meiriani, and T. Irmansyah. “Robusta Coffee (Coffea Robusta L.) Seed Germination Response in Various Plant Natural Growth Regulators With Soaking Duration”. Jurnal Online Pertanian Tropik, vol. 8, no. 3, Mar. 2022, pp. 195-02, doi:10.32734/jopt.v8i3.5358.