Hidayatillah, A., S. Subyantoro, and H. Haryadi. “Types of Defamation Speech Acts on Social Media Instagram, Twitter, and Facebook in 2017-2019”. Seloka: Jurnal Pendidikan Bahasa Dan Sastra Indonesia, Vol. 10, no. 2, Aug. 2021, pp. 150-9, doi:10.15294/seloka.v10i2.45647.