Columbia subject headings:
Harvard subject headings:
Automobile industry and trade--Germany--History
Porsche A.G.--History.
Porsche automobiles--History
Porsche family.
Volkswagen automobiles--History.
Princeton subject headings:
Automobile industry and trade--Germany--History.
Porsche A.G.--History.
Porsche automobiles--History.
Porsche family.
Volkswagen automobiles--History.