Ibn Nashwān, Muḥammad ibn Nashwān,  -1213 or 1214. <br/><br/>
Risālatān fī al-farq bayna al-ḍād wa-al-ẓāʼ, 
taʼlīf Muḥammad ibn Nashwān al-Ḥimyarī wa-Muḥammad ibn Yūsuf al-Andalusī. Bi-taḥqīq Muḥammad Ḥasan Āl Yāsīn. 
 - [al-Ṭabʻah al-ūlá.] 
 - [Baghdād,  1961.] 
 - 184 p.  facsims.  24 cm. 
<br/><br/>al-Muqaddimah -- Mukhtaṣṣar fī al-farq bayna al-ḍād wa-al-ẓāʼ, taʼlīf Muḥammad ibn Nashwān -- al-Irtiḍāʼ fī al-farq bayna al-ḍād wa-al-ẓāʼ, taʼlīf Athīr al-Dīn Muḥammad ibn Yūsuf al-Andalusī --  Murājiʻ al-taqdīm wa-al-taḥqīq (ṣ 179-182). 
<br/><br/><label>LCCN: </label>ne 62000701  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arabic language--Pronunciation.
<br/><br/><label>LC Class. No.: </label>PJ6317  / .H5