Amazon.com: Magazine Print Ad: 1980 Porsche 928, Consumer Orientation No 6,"The Blank Paper Principle. Genesis of Porsche's Newest and Best", 2 pages : Collectibles & Fine Art
A Porsche as an investment - Porsche Newsroom
1989 ad for Porsche 928 S4 | Porsche, Porsche 928, Vintage porsche