Güldner, S. (1986). Interface IS.
Lua i Stíl Chicago (17ú heag.)Güldner, Siegfried. Interface IS. Frankfurt/Oder, 1986.
Lua MLA (8ú heag.)Güldner, Siegfried. Interface IS. 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.