http://www.temple.edu/music/composers/sirme.html Biographical and critical essay from Diane Blum at Temple University's Esther Boyer College of Music. http://150.252.8.92/www/iawm/pages/sirmen.html Biography and illustration with discography and links. http://stevenestrella.com/composers/composerfiles/sirmen1818.html Biographical data, recommended CDs, books and sheet music, bibliography, and link to biographical essay from Dr. Estrella's Incredibly Abridged Dictionary of Composers.