Author: Ḥalqah al-Dirāsīyah al Maydānīyah li-Taqwīm al-Barāmij al-Arbaʻah li-Maḥw al-Ummīyah fī Jumhūrīyat al-Sūdān al-Dīmuqrāṭīyah (1980 Wad Madanī, Sudan, and Jazīrah, Sudan)