Sotheby's (Firm). (1969). Nineteenth century and modern prints ... November 1969. Sotheby.
Chicago Style (17th ed.) CitationSotheby's (Firm). Nineteenth Century and Modern Prints ... November 1969. London: Sotheby, 1969.
MLA (9th ed.) CitationSotheby's (Firm). Nineteenth Century and Modern Prints ... November 1969. Sotheby, 1969.
Warning: These citations may not always be 100% accurate.