“Pengaruh Pupuk Organik Dan Intensitas Naungan Terhadap Pertumbuhan Bibit Kopi Robusta (Coffee Canephora Pierre Ex Froehner)”. 2010. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 30 (1). https://doi.org/10.24831/jai.v30i1.1422.