Abbas also participated in a number of collaborative projects during his career. He served, alongside Clifford Edmund Bosworth, Jacob Lassner, Ehsan Yarshater and Franz Rosenthal, on the editorial board for William Montgomery Watt's book Muhammad at Mecca, itself a partial translation and summary of Muhammad ibn Jarir al-Tabari's History of the Prophets and Kings.[18][19] From 1951 to 1952, Abbas assisted fellow scholar Ahmad Amin and his student Shawqi Daif in editing and republishing an anthology of Egyptian contributions to Arabic poetry during the Middle Ages,[20] which had previously been thought to be minimal or non-existent.[21]