[1989] Summa, Secundae secunda, Quest. 96, Art. 1.
[1990] Contra Gentiles, III, 106.
[1991] For the opinions of Hincmar, Gratian, Peter Lombard, and other ecclesiastical authorities on this question of witchcraft and impotency see Hansen (1900), p. 153.
[1992] Quodlibet, XI, 10; Comment. in Lib. IV Sententiarum, Dist. 34, Art. 3.
[1993] In Isaiam, cap. 3; Summa, II, ii, 95; De sortibus, passim.
[1994] Contra Gentiles, III, 154.
[1995] Summa, II, ii, 95, art. 5.
[1996] Ibid., art. 6.
[1997] Summa, II, ii, 95, art. 7.
[1998] De sortibus, caps. 3-4.