APA (7th ed.) Citation

Sotheby's. (2013). Contemporary art: Day auction : auction in London, 18 October 2013. Sotheby's.

Chicago Style (17th ed.) Citation

Sotheby's. Contemporary Art: Day Auction : Auction in London, 18 October 2013. London: Sotheby's, 2013.

MLA (9th ed.) Citation

Sotheby's. Contemporary Art: Day Auction : Auction in London, 18 October 2013. Sotheby's, 2013.

Warning: These citations may not always be 100% accurate.