Speck, H. (1982). Unstruttal. Brockhaus.
Lua i Stíl Chicago (17ú heag.)Speck, Hans-Dieter. Unstruttal. Leipzig: Brockhaus, 1982.
Lua MLA (8ú heag.)Speck, Hans-Dieter. Unstruttal. Brockhaus, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.