Silvas, A., Theodoric, o. E., & Guibert, d. G. (1999). Jutta and Hildegard: The biographical sources. Pennsylvania State University Press.
Lua i Stíl Chicago (17ú heag.)Silvas, Anna, of Echternach Theodoric, agus de Gembloux Guibert. Jutta and Hildegard: The Biographical Sources. University Park, Pa.: Pennsylvania State University Press, 1999.
Lua MLA (8ú heag.)Silvas, Anna, et al. Jutta and Hildegard: The Biographical Sources. Pennsylvania State University Press, 1999.
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