Author: Ḥalqah al-Dirāsīyah al-ʻArabīyah ʻan al-Ẓurūf al-Biʼiyah wa-ʻAlāqatuhā bi-Khuṭaṭ al-Tanmiyah fī al-Duwal al-ʻArabīyah Khartum 1972.