“Respon Pertumbuhan Stek Kopi Robusta (Coffea Canephora Pierre Ex A. Froehner) Menggunakan Filtrat Bahan Alami Yang Mengandung Zat Pengatur Tumbuh Tumbuhan (ZPT) Alami: The Growth Response of Robusta Coffee Cuttings (Coffea Canephora Pierre Ex A. Froehner) Using Natural Ingredients Filtrate Containing Natural Plant Growth Regulatory Substances (PGR)”. 2023. Jurnal Ilmiah Inovasi 23 (1): 69-74. https://doi.org/10.25047/jii.v23i1.3861.