Abbasi, Abdul Malik, Amjad Ali Arain, Sameena Khokhar, and Maha Batool. “An Instrumental Study of Speech Variability of English Back-Rounded Vowels Between the English & Karachiites Pinglish: Acoustics of English Back-Rounded Vowels”. Pakistan Journal of Languages and Translation Studies 10, no. 2 (December 28, 2022): 40–60. Accessed April 25, 2024. https://pjlts.uog.edu.pk/index.php/pjlts/article/view/49.