"Civil Disobedience" by Henry David Thoreau at Amazon "The New Testament Basis of Pacifism" by G.H.C. Macgregor "National Defense thru Nonviolent Resistance" by Bradford Lyttle "On Revolution and Equilibrium" by Barbara Deming More here.
"Civil Disobedience" is actually free under the "Creative Commons". That book (and hundreds of others) can be found online for free. Found it here for instance: http://manybooks.net/titles/thoreauhetext93civil11.html
Thoreau was a pioneer. I knew of his essay on civil disobedience, but hadn't yet heard of MacGregor, Lyttle, and Deming. You into Chomsky or Zinn? On a lighter note, I recently attempted Thoreaus epic "chops".Needless to say, it just looked white trashy..
Anarchists and Anarchism is a collection of essays by George Woodcock, some about historical anarchism, and then it moves into how pacifism and anarchism naturally go together.