Ahmad, Jamil, Hanisah Hanisah, and Rozalina Rozalina. 2023. “WELFARE LEVEL OF RUBBER TAPPERS IN THE SUNGEI PUTIH RESEARCH UNIT, GALANG SUBDISTRICT, DELI SERDANG DISTRICT”. Jurnal Inovasi Penelitian 4 (7), 1259-66. https://doi.org/10.47492/jip.v4i7.2996.