1. Duo (1945) Collection: Concert Programs (SOM) Contributers: Alvin Etler (composer), Guillermo Perich (viola), and Wilma Zonn (oboe) Performance: Faculty Viola Recital Performance Date: 1976-03-23 Location: Music and Performing Arts Library, University of Illinois Concert Program: v.25 p.196
2. Suite in D minor Collection: Concert Programs (SOM) Contributers: Bach, J. S. (composer) and Guillermo Perich (viola) Performance: Faculty Viola Recital Performance Date: 1976-03-23 Location: Music and Performing Arts Library, University of Illinois Concert Program: v.25 p.196