Beechey, F.W., Beechey, H.W., 1828, Proceedings of the expedition to explore the northern coast of Africa from Tripoly eastward in MDCCCXXI and MDCCCXXII: comprehending an account of the Greater Syrtis and Cyrenaica and of the ancient cities composing the Pentapolis, London https://babel.hathitrust.org/cgi/pt?id=hvd.32044043150234;view=1up;seq=5