Klanten. Robert & Hellige, H. (2005). Illusive: Contemporary illustration and its context. Die-Gestalten.
Lua i Stíl Chicago (17ú heag.)Klanten. Robert agus Hendrick Hellige. Illusive: Contemporary Illustration and Its Context. Berlin, Germany: Die-Gestalten, 2005.
Lua MLA (9ú heag.)Klanten. Robert agus Hendrick Hellige. Illusive: Contemporary Illustration and Its Context. Die-Gestalten, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.