Langfeld, G. Greman art in the Netherlands before and after World War II: Gregor Langfeld. Avant-Garde and criticism.(2007).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLangfeld, Gregor. "Greman Art in the Netherlands Before and After World War II: Gregor Langfeld." Avant-Garde and Criticism.(2007) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रLangfeld, Gregor. "Greman Art in the Netherlands Before and After World War II: Gregor Langfeld." Avant-Garde and Criticism.(2007), .
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