APA (7th ed.) Citation

Sotheby's (Firm). (1989). Books, map, manuscripts and ephemera. Sotheby.

Chicago Style (17th ed.) Citation

Sotheby's (Firm). Books, Map, Manuscripts and Ephemera. London: Sotheby, 1989.

MLA (9th ed.) Citation

Sotheby's (Firm). Books, Map, Manuscripts and Ephemera. Sotheby, 1989.

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