Catholic Encyclopedia: St. Gabriel the Archangel - - Called "Fortitudo Dei." Mentioned in both the Old and New Testaments. http://www.newadvent.org/cathen/06330a.htm
Catholic Online: St. Gabriel, the Archangel - - Short paragraph. http://www.catholic.org/saints/saint.php?saint_id=279
Gabriel - - Brief article on this angel in the Bible and in post-Biblical Jewish tradition. From the 1911 Encyclopædia Britannica. http://encyclopedia.jrank.org/FRA_GAE/GABRIEL_Heb_SKns_man_of_God_.html
Gabriel the Archangel - - Illustrated profile. http://saints.sqpn.com/saintg03.htm
Gabriel's Site - - St. Gabriel's résumé, and several images of the archangel. http://www.frenchpress.com/layani.htm
Saint Gabriel, Archangel - - From the book "Lives of Saints," published by John J. Crawley. http://www.ewtn.com/library/MARY/GABRIEL.htm
St. Michael, St. Gabriel, St. Raphael - - About the three archangels mentioned in the Bible. Suitable for children. http://www.tntt.org/vni/tlieu/saints/St0929.htm