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CATHOLIC ENCYCLOPEDIA: Adrian Willaert
http://www.newadvent.org/cathen/15626a.htm
Biography.
Classical Net - Composers - Willaert
http://www.classical.net/music/comp.lst/acc/willaert.html
Biography.
Willaert, Adrian (c. 1490 - 1562), Belgium
http://stevenestrella.com/composers/composerfiles/willaert1562.html
Biographical data, recommended CDs, books and sheet music, bibliography, and links to biographical essays from Dr. Estrella's Incredibly Abridged Dictionary of Composers.