APA (7th ed.) Citation

Sotheby Parke Bernet Group. (1981). Important old master paintings - April 1981. Sotheby.

Chicago Style (17th ed.) Citation

Sotheby Parke Bernet Group. Important Old Master Paintings - April 1981. London: Sotheby, 1981.

MLA (9th ed.) Citation

Sotheby Parke Bernet Group. Important Old Master Paintings - April 1981. Sotheby, 1981.

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