Silvas, A., Theodoric, o. E., & Guibert, d. G. (1999). Jutta and Hildegard: The biographical sources. Pennsylvania State University Press.
Dyfyniad Arddull ChicagoSilvas, Anna, of Echternach Theodoric, and de Gembloux Guibert. Jutta and Hildegard: The Biographical Sources. University Park, Pa.: Pennsylvania State University Press, 1999.
Dyfyniad MLASilvas, Anna, et al. Jutta and Hildegard: The Biographical Sources. Pennsylvania State University Press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.