William F. Albright, “Notes on Ammonite History,” in Lawrence T. Geraty and Larry G. Herr, eds., The Archaeology of Jordan and Other Studies: Presented to Siegfrid H. Horn (Berrien Springs, MI: Andrews Univ. Press, 1986), pp. 503–509; George M. Landes, “The Material Civilization of the Ammonites,” Biblical Archaeologist 24 (1961), pp. 66–86; Herr, “What Ever Happened to the Ammonites?” BAR 19:06, “The Late Iron Age-Persian Ceramic Horizon at Tall al ‘Umayri,” Studies in the History and Archaeology of Jordan, vol. 5 (Amman: Department of Antiquities, 1995), pp. 617–619.