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 Friedrich Engels:

"

Popularly known as Anti-Dühring, this book is a detailed critique of the philosophical positions of Eugen Dühring, a German philosopher and critic of Marxism. In the course of replying to Dühring, Engels reviews recent advances in science and mathematics seeking to demonstrate the way in which the concepts of dialectics apply to natural phenomena. Many of these ideas were later developed in the unfinished work, Dialectics of Nature. Three chapters of Anti-Dühring were later edited and published under the separate title, Socialism: Utopian and Scientific.[citation needed]