Faraj, I. R., and T. S. Hamid. “The Role of Internal and External Individual Difference Factors in Bilingual Development: Exploring Highly Proficient Kurdish-English Bilinguals’ Perceptions”. Journal of University of Human Development, vol. 9, no. 3, July 2023, pp. 124-30, doi:10.21928/juhd.v9n3y2023.pp124-130.