APA (7th ed.) Citation

Sotheby's (Firm). (1990). Books and maps. Sotheby.

Chicago Style (17th ed.) Citation

Sotheby's (Firm). Books and Maps. London: Sotheby, 1990.

MLA (9th ed.) Citation

Sotheby's (Firm). Books and Maps. Sotheby, 1990.

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