http://www.reuters.com/article/2015/04/25/us-volkswagen-ceo-chairman-idUSKBN0NG0N720150425 (http://www.reuters.com/article/2015/04/25/us-volkswagen-ceo-chairman-idUSKBN0NG0N720150425)
http://www.bbc.com/news/business-32468360 (http://www.bbc.com/news/business-32468360)
http://www.autoblog.com/2015/04/25/volkswagen-group-chairman-ferdinand-piech-quits-vw/ (http://www.autoblog.com/2015/04/25/volkswagen-group-chairman-ferdinand-piech-quits-vw/)
seuraavaksi Porche-mies toimariksi?