“Patterns of Anarchy” is a collection of writings published in 1966. I came to it because a) Christopher Alexander quotes from it in “A Pattern Language” and b) because as a consultant and developer I’m interested in different patterns of organising.
Edited by L. Krimerman and L. Perry, the book brings together thinkers from across the anarchist spectrum and considers definitions of anarchism, anarchist critiques of socialism, it's philosophical foundations, and more.
There’s a lot in it, especially if like me, you don’t know much about anarchism beyond “A Homage to Catalonia”.
As this is going to be a long thread, I’m not going to waste time on a definition of "Anarchy". Trust me when I suggest you take a look at Wikipedia’s because it's probably not what you thought it was:
What interested me most about this book was the section “Constructive Anarchism: Alternative Communities and Programs”. (pp.312) This covers the *how* of anarchist organisation.