Thomas, Hugh, et al. “Results from the Aerial Archaeology in the Kingdom of Saudi Arabia, al‑ʿUlā (AlUla) and Khaybar Projects: 2018–2021”. Proceedings of the Seminar for Arabian Studies, vol. 51, Jan. 2023, pp. 27-51, https://archaeopresspublishing.com/ojs/index.php/PSAS/article/view/2005.