The Meaning of Confederalism by Murray Bookchin (Left Green, 1990)
He was a central figure in the American Green Movement and the Burlington Greens.
Ecology and Revolutionary Thought by Murray Bookchin (Anarchy [UK], 1964)
Thereafter Bookchin concluded that American anarchism was essentially individualistic and broke with anarchism publicly in 1999. He placed his ideas into a new political ideology: Communalism (spelled with a capital "C" to differentiate it from other forms of communalism), a form of libertarian socialism that retains his ideas about assembly democracy and the necessity of decentralization of settlement, power/money/influence, agriculture, manufacturing, etc.
What is Communalism? The Democratic Dimension of Anarchism by Murray Bookchin (1994)