See, for example, Theodor H. Gaster, Purim and Hanukkah in Custom and Tradition (New York: Schumann, 1959), p. 14; and K. V. H. Ringgren, “Esther and Purim,” Svensk Exegetisk Arsbok 20 (1956), pp. 5–24; Moore, Esther: Introduction, pp. xlvi–xlix.