1926年大奖赛赛季Golden Era of Grand Prix Racing. [2007-08-04]. （原始内容存档于2007-06-29）. Etzrodt, Hans. The 1925 Automobile World Championship. The Golden Era of Grand Prix
1924年大奖赛赛季Era of Grand Prix Racing. [2008-07-03]. （原始内容存档于2009-05-04）. Etzrodt, Hans. Grand Prix Winners 1895–1949 : Guidelines and notes. The Golden Era of Grand
1925年大奖赛赛季Golden Era of Grand Prix Racing. [2007-08-04]. （原始内容存档于2007-06-29）. Etzrodt, Hans. The 1925 Automobile World Championship. The Golden Era of Grand Prix
1927年大奖赛赛季Golden Era of Grand Prix Racing. [2007-08-05]. （原始内容存档于2007-06-29）. Etzrodt, Hans. The 1925 Automobile World Championship. The Golden Era of Grand Prix
1933年大奖赛赛季(1919–1933). The Golden Era of Grand Prix Racing. [2007-08-05]. （原始内容存档于2007-06-29）. Leif Snellman and Hans Etzrodt. 1933. The Golden Era of Grand Prix Racing