Mathias, William -- Bibliography. / https://id.loc.gov/authorities/names/n81139106 https://id.loc.gov/authorities/subjects/sh99001362 : Craggs, Stewart R.
Mathias, William -- Discography. / https://id.loc.gov/authorities/names/n81139106 https://id.loc.gov/authorities/subjects/sh00007650 : Craggs, Stewart R.