Ruhrberg, K. (1986). Twentieth century art: Painting and sculpture in the Ludwig Museum. Rizzoli.
Chicago Style (17th ed.) CitationRuhrberg, Karl. Twentieth Century Art: Painting and Sculpture in the Ludwig Museum. New York: Rizzoli, 1986.
MLA (8th ed.) CitationRuhrberg, Karl. Twentieth Century Art: Painting and Sculpture in the Ludwig Museum. Rizzoli, 1986.
Warning: These citations may not always be 100% accurate.