Fiana Asrofah, et al. “Effect of Liquid Organic Fertilizer NPK Mutiara NASA and Seed on Growth Orange Citron (Citrus medica): Pengaruh Pemberian Pupuk Organik Cair NASA Dan Pupuk NPK Mutiara Terhadap Pertumbuhan Bibit Jeruk Sitrun (Citrus Medica)”. Agrifarm: Jurnal Ilmu Pertanian, vol. 4, no. 1, July 2015, pp. 26-32, https://journal.uwgm.ac.id/agrifarm/article/view/1292.