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 Criticism of communist states:

"

Soviet-style central planning and state ownership has been another topic of criticism of communist rule. Works by economists such as Friedrich Hayek and Milton Friedman argue that the economic structures associated with communist rule resulted in economic stagnation. Other topics of criticism of communist rule include foreign policies of expansionism, environmental degradation and the suppression of free cultural expression.[citation needed]