Abbo, Garou, and Michael Etuge APUGE. “An Acoustic Analysis of Six English Monophthongs Produced by Undergraduate Cameroonian ESL Learners”. Journal of World Englishes and Educational Practices 5, no. 2 (August 17, 2023): 67–78. Accessed February 9, 2026. https://al-kindipublishers.org/index.php/jweep/article/view/5830.