On Anarchism by Noam Chomsky

Latest version of On Anarchism was published 2014 by Penguin, earlier versions available as PDF.

Penguin review says it's a short introduction to Chomsky's "distinctively optimistic brand of anarchism" while "refuting the notion of anarchism as a fixed idea, and disputing the traditional fault lines between anarchism and socialism."

The 2004 version of On Anarchism is available as a free PDF dowload.

See also 2013 speech on YouTube of Noam Chomsky: "What is Anarchism?"