Ḥalqah al-Dirāsīyah Ḥawla Qaḍāyā al-Taʻāwun al-Istihlākī fī al-Sūdān (1980 Khartoum, Sudan)

(Ḥalqah al-Dirāsīyah Ḥawla Qaḍāyā al-Taʻāwun al-Istihlākī fī al-Sūdān, 23-31 Aghusṭus, 1980 M.) al-Markaz al-Qawmī lil-Tanmiyah wa-al-Tadrīb al-Taʻāwunī