Al Ghoraibi، S.، و Ashby، M. (2010). The Substitution of the Voiceless Uvular Fricative [χ], the Voiceless Pharyngeal Fricative [ħ] and the Voiceless Glottal Fricative [h] by Late-Onset Native Speakers of American Standard English Learning Colloquial Hijazi Arabic Aurally in Saudi Arabia (رسالة ماجستير غير منشورة). University College London، لندن. مسترجع من http://search.mandumah.com/Record/602377
Al Ghoraibi، Sarah، و Michael Ashby. "The Substitution of the Voiceless Uvular Fricative [χ], the Voiceless Pharyngeal Fricative [ħ] and the Voiceless Glottal Fricative [h] By Late-Onset Native Speakers of American Standard English Learning Colloquial Hijazi Arabic Aurally in Saudi Arabia" رسالة ماجستير. University College London، لندن، 2010. مسترجع من http://search.mandumah.com/Record/602377