Yusriadi, Y., L. Lukman, and A. Abbas. “The Imperative Speech-Act and Language Politeness for Government Officers of South Sulawesi in THE NEW SULSEL Book”. ELS Journal on Interdisciplinary Studies in Humanities, vol. 4, no. 4, Dec. 2021, pp. 527-34, doi:10.34050/elsjish.v4i4.19541.