Ziony Zevit, “The Priestly Redaction and Interpretation of the Plague Narrative in Exodus,” Jewish Quarterly Review 67 (1976), pp. 193–211; Nahum H. Sarna, Exploring Exodus (New York: Schocken, 1986), pp. 68–80; Zevit, “Three Ways to Look at the Ten Plagues,” Bible Review, June 1990.