APA (7th ed.) Citation

Sotheby's (Firm). (1986). Postage stamps of the world. Sotherby's.

Chicago Style (17th ed.) Citation

Sotheby's (Firm). Postage Stamps of the World. London: Sotherby's, 1986.

MLA (9th ed.) Citation

Sotheby's (Firm). Postage Stamps of the World. Sotherby's, 1986.

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