Crassard, Rémy, and Yamandu H. Hilbert. “Lower and Middle Paleolithic Sites from the Rufa Graben, Central Saudi Arabia”. Proceedings of the Seminar for Arabian Studies 50, no. 2 (January 1, 2020): 43–65. Accessed December 1, 2023. http://archaeopresspublishing.com/ojs/index.php/PSAS/article/view/1187.