Resolution: Jon Astley - Interview with the singer and recording engineer, regarding his work on the 5.1 mix of "Tommy" by The Who. - http://www.resolutionmag.com/pdfs/INTERV~1/JOHNAS~1.PDF
All Music Guide: Jon Astley - Biography and discography. - http://www.allmusic.com/cg/amg.dll?p=amg&sql=11:3z1tk6kx9krk