Below are links to a number of books recommended in my book How to Really Occupy Wall Street. These books are all in PDF format and can be legally downloaded for free as they are in the public domain (their copyright has expired since they were published before 1923).
Usury and the Church of England by Rev. Henry Swabey
The Wealth of Nations by Adam Smith
Unto This Last and Other Essays by John Ruskin
A Manual of Political Economy by E. Peshine Smith