Riyadh, Muhammad. 2019. “EFFECT OF USE OF RICE HARVESTING TECHNOLOGY ON RICE FARMERS EARNING AND RICE HARVEST WORK IN SUKAMANDI VILLEGE DISTRICT DELI SERDANG OF NORTH SUMATERA”. SOSIAL DAN EKONOMI PERTANIAN 12 (2), 46 - 54. https://jurnalfp.uisu.ac.id/index.php/sep/article/view/22.