Hamer, D. (1989). Gerhard Marcks. Hinstorff.
Lua i Stíl Chicago (17ú heag.)Hamer, Detlef. Gerhard Marcks. Rostock: Hinstorff, 1989.
Lua MLA (8ú heag.)Hamer, Detlef. Gerhard Marcks. Hinstorff, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.