Yusuf, Y. M., and B. Pratiwi. “The Ability of Students in Using English Adverbs at State Politechnic of Pangkajene Kepulauan”. ELS Journal on Interdisciplinary Studies in Humanities, vol. 2, no. 3, Sept. 2019, pp. 431-8, doi:10.34050/els-jish.v2i3.6202.