APA (7th ed.) Citation

Sotheby's (Firm). (1990). Post war and contemporary art 22nd February 1990. Sotheby's.

Chicago Style (17th ed.) Citation

Sotheby's (Firm). Post War and Contemporary Art 22nd February 1990. London: Sotheby's, 1990.

MLA (9th ed.) Citation

Sotheby's (Firm). Post War and Contemporary Art 22nd February 1990. Sotheby's, 1990.

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