Al-Jallad, Ahmad (2020), chapter ʿArab, ʾAʿrāb, and Arabic in Ancient North Arabia: The first attestation of (ʾ)ʿrb as a group name in Safaitic, in Arabian Archaeology and Epigraphy, volume 31, issue 2, DOI:10.1111/aae.12157, pages 422–435