Wachjar, Ade, and Luga Kadarisman. “Pengaruh Kombinasi Pupuk Organik Cair Dan Pupuk Anorganik Serta Frekuensi Aplikasinya Terhadap Pertumbuhan Tanaman Kakao (Theobroma Cacao L.) Belum Menghasilkan”. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 35, no. 3 (1). Accessed January 21, 2022. https://jurnal.ipb.ac.id/index.php/jurnalagronomi/article/view/1334.