Madani, Mohammad Faris, dan Irma Wardati. “Respon Pertumbuhan Bibit Kelapa Sawit ( Elais Guineensis Jacq.) Varietas DxP Simalungun Terhadap Aplikasi PGPR Dan Trichoderma Sp. Di Pre Nursery”. Agropross : National Conference Proceedings of Agriculture (September 29, 2023): 332–339. Diakses Juli 3, 2024. https://proceedings.polije.ac.id/index.php/agropross/article/view/487.