Lua APA (7ú heag.)

Langfeld, G. Greman art in the Netherlands before and after World War II: Gregor Langfeld. Avant-Garde and criticism.(2007).

Lua i Stíl Chicago (17ú heag.)

Langfeld, Gregor. "Greman Art in the Netherlands Before and After World War II: Gregor Langfeld." Avant-Garde and Criticism.(2007) .

Lua MLA (8ú heag.)

Langfeld, Gregor. "Greman Art in the Netherlands Before and After World War II: Gregor Langfeld." Avant-Garde and Criticism.(2007), .

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.