Mathias, William: Entry from the Gilder-MusicWeb Dictionary of Composers with brief biography and chronological list of works.
Mathias, William James: Brief biography noting stylistic tendencies, studies, and output of works from the Grove Concise Dictionary of Music entry at WQXR radio.
Mathias,William: Listing of his clarinet works noting instruments used and related works by others.
OUP: Mathias: Article from Oxford University Press with photograph, catalogue of works, discography, and MP3 audio sample.
William Mathias: Digest of reviews from Classics Today with cover art and purchase information.
William Mathias (1934-1992): Biographical article by by David Wright for MusicWeb with photography, recommended recordings, and information on the recording prize named for him.
William Mathias (1934-1992): Listing at The Lied and Art Song Texts Page with lyrics to selected vocal works.