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Catholic Encyclopedia
http://www.newadvent.org/cathen/06533c.htm
St. Gertrude of Nivelles, Benedictine abbess of a double monastery, d. 659.
For All the Saints
http://www.saintpatrickdc.org/ss/0317.htm#gert
Brief biography of St. Gertrude of Nivelles, with links to other saints with whom she was associated.
Patron Saints Index
http://www.catholic-forum.com/saints/saintg14.htm
Profile of St. Gertrude of Nivelles.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/gertniv.html
Short biography of St. Gertrude of Nivelles, by Karen Rae Keck.