Khaerunisa, Neng Widi, and Kheryadi Kheryadi. “A Morphological Analysis of Derivational Affixes in the Video of Barack Obama’s Speech”. LETS: Journal of Linguistics and English Teaching Studies 2, no. 2 (June 15, 2021): 81-92. Accessed September 23, 2021. http://stainmajene.id/index.php/lets/article/view/67.