APA (7th ed.) Citation

Sotheby's (Firm). (1990). Russian Twentieth Century and Avant-Garde art. Sotheby's.

Chicago Style (17th ed.) Citation

Sotheby's (Firm). Russian Twentieth Century and Avant-Garde Art. London: Sotheby's, 1990.

MLA (9th ed.) Citation

Sotheby's (Firm). Russian Twentieth Century and Avant-Garde Art. Sotheby's, 1990.

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