Seefeldt, D. (1981). Stress was tun ? Verlag Tribüne.
Lua i Stíl Chicago (17ú heag.)Seefeldt, Dieter. Stress Was Tun ? Berlin: Verlag Tribüne, 1981.
Lua MLA (8ú heag.)Seefeldt, Dieter. Stress Was Tun ? Verlag Tribüne, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.