Hentschel, M., & Longo, R. (2002). Robert Longo: The Freud Drawings. Kerber.
Lua i Stíl Chicago (17ú heag.)Hentschel, Martin, agus Robert Longo. Robert Longo: The Freud Drawings. Bielefeld: Kerber, 2002.
Lua MLA (8ú heag.)Hentschel, Martin, agus Robert Longo. Robert Longo: The Freud Drawings. Kerber, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.