Crone, PatriciaPatriciaCrone2018-09-282018-09-281989Crone, Patricia, ‘On the Meaning of the ʿAbbasid Call to al-Riḍā’. In C. E. Bosworth, Charles Issawi, Roger Savory and A. L. Udovich (eds.), The Islamic World from Classical to Modern Times: Essays in Honor of Bernard Lewis, Princeton, NJ: Darwin Press, 1989, 95–111 (= From Arabian Tribes to Islamic Empire, no. VII).0878500669https://hdl.handle.net/20.500.12111/5508enBernard LewisAbbasidal-RidaBook chapter