handayani, Kusuma, et al. “The Contributions of Soil Biochemical Properties As Determinant of Pineapple (Ananas Comosus [L.] Merr.) Plantation LandProductivity in Central Lampung Regency”. Jurnal Pengelolaan Sumberdaya Alam Dan Lingkungan (Journal of Natural Resources and Environmental Management), vol. 12, no. 4, Nov. 2022, pp. 729-3, https://doi.org/10.29244/jpsl.12.4.729-739.