Shenina, Kalifa Mohamed, و Hawa Mohammed Saleh Es-skare. 2019. "Gender Variation in Voice Quality in Learning English as A foreign Language: An Investigation into Libyan Learners’ Perceptions". مجلة البحوث الأكاديمية 13 (يناير): 108-17. https://doi.org/10.65540/jar.v13i.942.