PURWANINGRUM, Y. .; NAPITUPULU, J. .; HANUM, C. .; SIREGAR, T. PENGARUH SISTEM EKSPLOITASI TERHADAP PRODUKSI KARET PADA KLON PB260. Jurnal Online Pertanian Tropik, [S. l.], v. 3, n. 1, p. 62–69, 2019. DOI: 10.32734/jopt.v3i1.2958. Disponível em: https://idjpcr.usu.ac.id/jpt/article/view/2958. Acesso em: 5 aug. 2025.