Ali، Z. A. (2010). A Theoretical Study Of English and Arabic Vowels With Reference to Cardinal Vowels. مجلة الآداب، ع92 ، 23 - 56. مسترجع من http://search.mandumah.com/Record/667364
Ali، Zaynab Abudi. "A Theoretical Study Of English and Arabic Vowels With Reference to Cardinal Vowels." مجلة الآداب ع92 (2010): 23 - 56. مسترجع من http://search.mandumah.com/Record/667364