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 2000:

This text is part of the article's lead section, so referencing it may be optional. Please see WP:CITELEAD for more information.

"

Popular culture holds the year 2000 as the first year of the 21st century and the 3rd millennium[citation needed],[3] because of a tendency to group the years according to decimal values, as if non-existent year zero was counted. According to the Gregorian calendar, these distinctions fall to the year 2001, because the 1st century was retroactively said to start with the year AD 1. Since the Gregorian calendar does not have year zero, its first millennium spanned from years 1 to 1000 inclusively and its second millennium from years 1001 to 2000. (For further information, see century and millennium.)