Sotheby Parke Bernet Group. (1980). Ephemera from the sixteenth century to the present day. Sotheby.
Chicago Style (17th ed.) CitationSotheby Parke Bernet Group. Ephemera from the Sixteenth Century to the Present Day. London: Sotheby, 1980.
MLA (9th ed.) CitationSotheby Parke Bernet Group. Ephemera from the Sixteenth Century to the Present Day. Sotheby, 1980.
Warning: These citations may not always be 100% accurate.