APA
Sotheby's (Firm), . (1996). Old master paintings : Sotheby's, London, Wednesday, 17th April, 1996 at 10:30 am. London: Sotheby's.
Chicago
Sotheby's (Firm), . 1996. Old master paintings : Sotheby's, London, Wednesday, 17th April, 1996 at 10:30 am. London: Sotheby's.
Harvard
Sotheby's (Firm), . (1996). Old master paintings : Sotheby's, London, Wednesday, 17th April, 1996 at 10:30 am. London: Sotheby's.
MLA
Sotheby's (Firm), . Old master paintings : Sotheby's, London, Wednesday, 17th April, 1996 at 10:30 am. London: Sotheby's. 1996.