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 Long-distance running:

"

Depending on the rules and terrain, navigation sports such as foot orienteering and rogaining may contain periods of endurance running within the competition.[citation needed] Variants of adventure racing may also combine navigational skills and endurance running in this manner.[6]