D.M. Conradt # PORSCHE 911 TURBO #1st ed. 1991, MINT
Design classics# Ferdinand Porsche, PORSCHE 911#nm,1997
Lewis # PORSCHE # folio sized , Konemann, 1994, mint
Porsche # PORSCHE ZEITTAFEL 1931-2008 / timeline leperello# Heel,
Porsche Museum # DIE AUTOS / THE CARS # 2012, mint