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 Nunchaku:

"

Nunchaku is often the first weapon wielded by a student, to teach self-restraint and posture, as the weapon is liable to hit the wielder more than the opponent if not used properly.[citation needed]