Kopanias, Konstantinos, and Giota Barlagianni. “Unequal in Life But Equal in Death? The Mortuary Evidence for Social Stratification in the Ubaid Polities”. Ash-Sharq: Bulletin of the Ancient Near East – Archaeological, Historical and Societal Studies, vol. 3, no. 1, Oct. 2019, pp. 1-21, https://archaeopresspublishing.com/ojs/index.php/ash-sharq/article/view/711.