Kitāb fī uṣūl al-lughah - Aḥmad, Muḥammad Khalaf Allāh.; Amīn, Muḥammad Shawqī. (al-Hayʾah al-ʻĀmmah li-shuʾūn al-Maṭābiʻ al-Amīriyah, 1969)