Dickhoff, W. (2006). Dennis Grün: Upgrade. Dickhoff.
Lua i Stíl Chicago (17ú heag.)Dickhoff, Wilfried. Dennis Grün: Upgrade. Köln: Dickhoff, 2006.
Lua MLA (8ú heag.)Dickhoff, Wilfried. Dennis Grün: Upgrade. Dickhoff, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.