Bi-munāsibat al-iḥtifāl bi-ʻayād Māyū 1970 naẓarah fī tārīkhinā al-siyāsī al-muʻāṣir 1956-1969 - Bīlī, ʻUthmān Sayyid Aḥmad Ismāʻīl ([Dār al-Ṭibāʻah Jāmiʻat al-Khartūm], 1970)