Melton, J. Gordon (2011). Religious Celebrations(en inglés). ABC-CLIO. p. 915. ISBN9781598842050. «Her feast day commemorates both the movement of her relics to Eichstatt and her canonization, both of which occurred on May 1.»
Canaday, John (2000). The Nuclear Muse: Literature, Physics, and the First Atomic Bombs(en inglés). University of Wisconsin Press. p. 98. ISBN9780299168544. (requiere suscripción). «Walpurgis Night falls on the eve of the feast day of St. Walpurga, an English missionary who was celebrated in the Middle Ages as a protectress against magic. It was a night when witches were believed to ride freely through the land.»
Upton, George Putnam (1912). The Standard Concert Guide(en inglés). A.C. McClurg & Company. p. 294. «In his separate poem Goethe seeks to go back to the origin of the first Walpurgis Night. May-day eve was consecrated to Saint Walpurgis, who converted the Saxons from Druidism to Christianity, and on that night the evil spirits were said to be abroad.»
Stark, Lucien (1998). Brahms's Vocal Duets and Quartets with Piano(en inglés). Indiana University Press. p. 100. ISBN9780253334022. «Walpurgis Night, named for St. Walpurga (d. A.D. 777), an English saint whose feast day falls on May Day, is the evening of 30 April (May Day eve) when, as was widely held--particularly during medieval and Renaissance times--witches celebrate a sabbath. Still today there are places where bonfires are kept burning all night to repel the evil spirits.»
Murray, J. (1843). A handbook for travellers in southern Germany(en inglés). p. 90. «In the Church of St. Walpurgis are preserved the remains of that Saint. They are interred beneath the high altar, and a stream of oil, which obtains the highest repute for its medicinal qualities, flows from them, between the months of October and May. On St. Walpurgis' Day, May 1, many thousand pilgrims repair to her shrine.»
Wunderli, Richard M. (1992). Peasant Fires(en inglés). Indiana University Press. p. 46. ISBN9780253207517. «Between Easter and Pentecost were many other celebrations and feast days. In Germany, for example, was celebrated the Feast of St. Walburga, or Walpurgisnacht, on April 30, the eve of May Day. Walburga was an eighth-century Anglo-Saxon nun and missionary to Franconia, particularly to Bischofsheim on the Tauber, just south of Niklashausen. Her bones were "translated" (that is, moved) on 30 April—which became her feast day—sometime during the 870s to Eichstätt, where her brother Willibald had been bishop. Ever since then an oily liquid has oozed out of the rock on which her tomb rests, and has been renowned among pilgrims for its great healing power.»
