Rudolph Cohen, “The Iron Age Fortresses in the Central Negev,” BASOR 236 (1979), p. 63. This is actually a revision, based on more recent information, of a classification suggested earlier by Yohanan Aharoni. Yohanan Aharoni, “Forerunners of the Limes: Iron Age Fortresses in the Negev,” IEJ 17 (1967), p. 3.