“Invasion of Paddy Combine Harvester (PCH) and Its Socioeconomic Impacts: A Study Based on Ampara District, Sri Lanka”. Academic Journal of Interdisciplinary Studies 9, no. 5 (September 21, 2020): 138. Accessed November 24, 2024. https://www.richtmann.org/journal/index.php/ajis/article/view/12206.