S. Ngapiyatun, D. Payang, Robi, H. . Aziza, wartomo, and E. Malaysia, “Studi Evaluasi Manajemen Penerapan Teknik Pemupukan Tanaman Kelapa Sawit Menggunakan Prinsip Empat Tepat (4T) di Perkebunan Sawit Long Mesangat: Management Evaluation Study of the Application of Oil Palm Fertilization Techniques Using Principle of Four Right (4R) in Long Mesangat Oil Plantations”, buletinloupe, vol. 19, no. 01, pp. 71–78, Jun. 2023.