Sotheby's. (1997). German and Austrian 20th century art. Sotheby's.
Chicago Style (17th ed.) CitationSotheby's. German and Austrian 20th Century Art. London: Sotheby's, 1997.
MLA (8th ed.) CitationSotheby's. German and Austrian 20th Century Art. Sotheby's, 1997.
Warning: These citations may not always be 100% accurate.
