Ahmad, J., Hanisah, H., & Rozalina, R. (2023). WELFARE LEVEL OF RUBBER TAPPERS IN THE SUNGEI PUTIH RESEARCH UNIT, GALANG SUBDISTRICT, DELI SERDANG DISTRICT. Jurnal Inovasi Penelitian, 4(7), 1259-1266. https://doi.org/10.47492/jip.v4i7.2996