Haq, A. S., L. M. Indrayani, and Y. S. Soemantri. “ATTITUDINAL MEANING IN MARTIN LUTHER KING JR SPEECH: A FUNCTIONAL GRAMMAR APPROACH”. Celtic : A Journal of Culture, English Language Teaching, Literature and Linguistics, vol. 7, no. 1, June 2020, pp. 14-22, doi:10.22219/celtic.v7i1.12126.