R. Rahmawati, P. Penyang, E. . K. Firdara, Y. . T, R. Rosdiana, and P. . E. Putir, “Changes In Physical and Chemical Properties of Peat In Various Ages of Oil Palm Plant In East Kotawaringin District”, devotion, vol. 3, no. 12, pp. 1132–1148, Oct. 2022.