General Bibliography
- Sotheby's - 2004 (III)
- Sotheby's - 2005
- Sotheby's - 2005 (II)
- Sotheby's - 2005 (III)
- Sotheby's - 2006
- Sotheby's - 2006 (II)
- Sotheby's - 2006 (III)
- Sotheby's - 2007
- Sotheby's - 2007 (II)
- Sotheby's - 2008
- Sotheby's - 2008 (II)
- Sotheby's - 2009
- Sotheby's - 2009 (II)
- Sotheby's - 2010
- Sotheby's - 2011
- Sotheby's - 2011 (II)
- Sotheby's - 2012
- Sotheby's -2000 (III)
- Sothevy's - 1995 (III)
- Speyer, Edward - 1925