Rivandani, I., dan D. Hartatie. “Perbanyakan Vegetatif Tanaman Kopi Robusta (Coffea Canephora) Berbagai Macam Klon Terhadap Keberhasilan Sambung Dini”. Agropross : National Conference Proceedings of Agriculture, vol. 3, September 2019, hlm. 153-61, https://proceedings.polije.ac.id/index.php/agropross/article/view/527.