Lua APA (7ú heag.)

Raap, J. (2004). Robert Crumb: "Yeah, but is it Art? ; Drawings and Comics ; Museum Ludwig Köln, 28.5.-12.9.2004. Kunstforum.

Lua i Stíl Chicago (17ú heag.)

Raap, Jürgen. "Robert Crumb: "Yeah, but Is It Art? ; Drawings and Comics ; Museum Ludwig Köln, 28.5.-12.9.2004." Kunstforum 2004.

Lua MLA (8ú heag.)

Raap, Jürgen. "Robert Crumb: "Yeah, but Is It Art? ; Drawings and Comics ; Museum Ludwig Köln, 28.5.-12.9.2004." Kunstforum, 2004.

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