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 Castalia:

"

The Castalia or Castalian Spring was the name of a spring near Delphi, sacred to the Muses, mentioned by many authors.[1] According to old traditions, the Castalian Spring already existed by the time Apollo came to Delphi searching for Python.[2] According to some, the water was a gift to Castalia from the river Cephisus.[citation needed]