Joseph A. Callaway, “New Evidence on the Conquest of Ai,” Journal of Biblical Literature 87 (1968), pp. 312–320; for further discussion, see Yigael Yadin, “Is the Biblical Account of the Israelite Conquest of Canaan Historically Reliable?” BAR 08:02; Ziony Zevit, “The Problem of Ai,” BAR 11:02.