Marbun, Lusiana, and Herwandi Herwandi. “Kesantunan Tuturan Interogatif Dalam Acara Online Media Gathering Dampak Covid-19 Pada Petani Sawit RSPO DI Youtube”. J-LELC: Journal of Language Education, Linguistics, and Culture, vol. 1, no. 1, Feb. 2021, pp. 79-86, doi:10.25299/j-lelc.2021.6237.