Muhammad Yassir (2024) “Thickening of Rubber Sap (Hevea brasilliensis) Through the Utilization of Natural Ingredients Noni Fruit Extract (Morinda citrifolia L.) (Students Field Practice of Human and Environmental Subject)”, Jurnal Serambi Ilmu, 22(2), pp. 287–298. doi: 10.32672/jsi.v22i2.980.