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 Nihilism:

"

Postmodern and poststructuralist thought has questioned the very grounds on which Western cultures have based their 'truths': absolute knowledge and meaning, a 'decentralization' of authorship, the accumulation of positive knowledge, historical progress, and certain ideals and practices of humanism and the Enlightenment.[citation needed]