Pitri, N., and violita violita. “Response of Robusta Coffee (Coffea canephora.L) Germination Stages That Get Treatment With Long Soaking and Gibberellin Concentration (GA3)”. Jurnal Serambi Biologi, Vol. 7, no. 4, Dec. 2022, pp. 290-0, doi:10.24036/srmb.v7i4.63.