Amar, L., F. Mu’in, and A. Rusmanayanti. “Students’ Perceptions on The Use of Tongue Twisters in Learning Pronunciation”. LINGUA EDUCATIA, Vol. 1, no. 2, Dec. 2019, pp. 73-92, https://jtam.ulm.ac.id/index.php/gej/article/view/293.