Richter, Tobias, et al. “Pearl Fishers, Townsfolk, Bedouin, and Shaykhs: Economic and Social Relations in Islamic Al-Zubārah”. Proceedings of the Seminar for Arabian Studies, vol. 41, Sept. 2011, pp. 317-33, https://archaeopresspublishing.com/ojs/index.php/PSAS/article/view/1697.