Catholic Community Forum: Pope St. Pius V
Biographical sketch.
Catholic Encyclopedia: Pope St. Pius V
Biography of the sixteenth-century pontiff.
For All the Saints: Pius V
Long biographical essay on the Dominican pope, reformer, and saint who combatted Lutheranism and Calvinism.
Popes Through the Ages: St. Pius V
Brief account of his pontificate.
St Pius V, Pope, Confessor
Entry in Alban Butler's Lives of the Saints.
The Saints: St. Pius V
Article from "The Saints: A Concise Biographical Dictionary."