Temirov, Maksud. 2014. “Improving Intelligibility of Voiced and Voiceless ‘th’ Consonants in the Speeches of Sophomores Using Pronunciation Drills”. JLT: Jurnal Linguistik Terapan 4 (1):27-49. https://jurnal.polinema.ac.id/index.php/jlt/article/view/279.