Ambrose of Milan, Bishop and Doctor - - Brief biography, with some asides on Arianism, and prayer in traditional and contemporary language. http://elvis.rowan.edu/~kilroy/JEK/12/07.html
Ambrose, Saint - - Biographical entry in the Columbia Encyclopedia. Includes short bibliography. http://www.bartleby.com/65/am/Ambrose.html
Catholic Encyclopedia: St. Ambrose - - Article on the life and teachings of this Bishop of Milan, and Doctor of the Church, who died in 397. http://www.newadvent.org/cathen/01383c.htm
The Ecole Initiative: Ambrose of Milan - - Article on the career of St. Ambrose, by Ivor J. Davidson. Includes an extensive bibliography. http://www2.evansville.edu/ecoleweb/articles/ambrose.html
Lives of Saints: Ambrose of Milan - - Profile of this bishop, confessor, and Doctor of the Church. From the book "Lives of Saints," published by John J. Crawley. http://saints.sqpn.com/sta07001.htm
Prologomena to St. Ambrose - - From the Nicene and Post-Nicene Fathers of the Christian Church, second series, vol. 10. Introduction to the life and writings of St. Ambrose, with a timeline. http://www.ccel.org/ccel/schaff/npnf210.toc.html