Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Nürburgring:

This text has been unreferenced on Wikipedia for a very long time. If you can't find a source, be bold and remove it!

"

Both the Nürburgring and the Hockenheimring events have been losing money due to high and rising Formula One license fees charged by Bernie Ecclestone and low attendance due to high ticket prices;[4][5][citation needed] starting with the 2007 Formula One season, Hockenheim and Nürburgring alternated in hosting the German GP.