Barbara Newman: Hildegard of Bingen: Visions and Validation, s. 163–175. Church History 54 (1985). . Teos Google Booksissa (viitattu 31.1.2012). (englanniksi)[vanhentunut linkki] Barbara Newman: Sister of Wisdom: St. Hildegard’s Theology of the Feminine. Berkeley and Los Angeles: University of California Press, 1987. Teos Google Booksissa (viitattu 31.1.2012). (englanniksi)
F. Donald Logan: History of the Church in the Middle Ages, s. 109–114. . Teos Google Booksissa (viitattu 16.9.2018). (englanniksi)
Ernst Probst: Hildegard von Bingen- Die deutsche Prophetin, s. 8. Grin Verlag, 2010. Teos Google Booksissa (viitattu 4.2.2012). (saksaksi)
Annice Callahan: Evelyn Underhill: spirituality for daily living, s. 42. University Press of America, 1997. Teos Google Booksissa (viitattu 31.8.2010). (englanniksi)
Erika A. Kuhlman: A to Z of women in world history, s. 215. . Teos Google Booksissa (viitattu 2.2.2012). (englanniksi)
Meijer Wertheimer: Listening to Their Voices: The Rhetorical Activities of Historic Women. Ed. Molly Meijer Wertheimer, s. 199–214. artikkeli: Julia Dietrich, "The Visionary Rhetoric of Hildegard of Bingen". Columbia: University of South Carolina Press, 1997. Teos Google Booksissa (viitattu 2.2.2012). (englanniksi)
Jo Ann McNamara: Sisters in arms: Catholic nuns through two millennia, s. 237. . Teos Google Booksissa (viitattu 2.2.2012). (englanniksi)
Barbara Newman: Hildegard of Bingen: Visions and Validation, s. 163–175. Church History 54 (1985). . Teos Google Booksissa (viitattu 31.1.2012). (englanniksi)[vanhentunut linkki] Barbara Newman: Sister of Wisdom: St. Hildegard’s Theology of the Feminine. Berkeley and Los Angeles: University of California Press, 1987. Teos Google Booksissa (viitattu 31.1.2012). (englanniksi)
Jennifer M. Randall: Early Medieval Rhetoric- Epideictic Underpinnings in Old English, s. 8. "were codified within the eleventh century and firmly established by the thirteenth: letter writing, ars dictaminis; preaching, ars praedicandi; and poetry, ars poetria". Georgia State University. Teoksen verkkoversio (viitattu 16.9.2018). (englanniksi)
June Boyce-Tillman: "Hildegard of Bingen at 900: The Eye of a Woman" (pdf) (The Musical Times 139, no. 1865 (Winter, 1998): 35) web.archive.org. Viitattu 2.9.2010. (englanniksi)Web archive 2014