Britannia: St. Boisil - A brief biography of the seventh-century Abbot of Melrose. - http://www.britannia.com/bios/saints/boisil.html
Catholic Encyclopedia: St. Boisil - Abbot of Melrose, renowned for prophetic gifts, taught St. Cuthbert. St. Boisil died in 664. - http://www.newadvent.org/cathen/02625a.htm