1. Arabic Speech Audiomentry
2. Amayreh, M., Hamdan, J. & Fareh, S. 1999. Consonant frequency in Arabic and English. In: Lewis Mukattash (ed.) Proceedings of the First International Conference on Arabic-English Contrastive and Comparative Studies. University of Jordan, Dirasat, Special Issue, pp. 207–220.
3. ASHA. 1988. Guidelines for determining threshold level for speech. American Speech- Language Hearing Association, 30, 85–89.