Ruggles, Carl (née Charles Sprague Ruggles)
- Provides a brief article and a set of categorized links to other related sites. Genealogical information is provided on a separate page connecting him to a large family with origins in the 15th century.
- http://freepages.history.rootsweb.com/~dav4is/people/RUGG1206.htm

Carl Ruggles
- Biography and photograph from Presser music publishers. Emphasis on the personality of the composer and the powerful complexity of his music.
- http://www.presser.com/Composers/info.cfm?Name=CARLRUGGLES

The Carl Ruggles Papers
- Title page, collection information, correspondence, programs, art exhibit catalogs, clippings, personal papers, art by himself and others, his music, works by others, his recordings, and music by others. In the Irving S. Gilmore Music Library of Yale Univ
- http://webtext.library.yale.edu/xml2html/music/rug-d.htm