Christhoperos, J. (2024) “Analysis of Knowledge of Fertilization Employees on the Application of 4R’s Principle in Production Plant Fertilization Activities at Mutiara Estate PT. Sentosa Kalimantan Jaya”, Buletin Loupe, 20(02), pp. 137–144. doi: 10.51967/buletinloupe.v20i02.3176.