Classic Cat: Widor - Directory of mp3s on the internet that have been made available by their performing artists. - http://www.classiccat.net/widor_c/index.htm
Widor, Charles-Marie (1844 - 1937), France - Biographical data, recommended CDs, books and sheet music, bibliography, and links to biographical essays from Dr. Estrella's Incredibly Abridged Dictionary of Composers. - http://stevenestrella.com/composers/composerfiles/widor1937.html