APA (7th ed.) Citation

Sotheby's (Firm). (1991). Post war and contemporary art ... 27 June 1991 Catalogue. Sotheby's.

Chicago Style (17th ed.) Citation

Sotheby's (Firm). Post War and Contemporary Art ... 27 June 1991 Catalogue. London: Sotheby's, 1991.

MLA (9th ed.) Citation

Sotheby's (Firm). Post War and Contemporary Art ... 27 June 1991 Catalogue. Sotheby's, 1991.

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