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 Richard Francis Burton:

"

On being laughed at by a fellow undergraduate, he responded by challenging him to a duel.[11] While there, he sat under the Christian teaching of John Henry Newman, "[t]he only preacher Burton would listen to";[11] Greenhill, Burton's mentor, was Newman's churchwarden.[citation needed]