Catholic Encyclopedia - St. Burchard of Würzburg, first bishop of that city, d. about 754. Feast day: 14 October. www.newadvent.org/cathen/03064b.htm
Catholic Online - Short biography with some minor factual errors: the year of Burchard's trip to Rome, and the date of his death. saints.catholic.org/saints/burchard.html
For All the Saints - Biography of St. Burchard of Würzburg, also called Burckard. users.erols.com/saintpat/ss/1014.htm#burc