Rudolph Rocker, Anarcho-Syndicalism,

http://libcom.org/library/anarcho-syndicalism-rudolf-rocker

Emma Goldman, Anarchism and Other Essays, http://xroads.virginia.edu/~hyper/goldman/toc.html

Paul Mattick, Workers’ Control,

http://www.marxists.org/archive/mattick-paul/1967/workers-control.htm 

Eric Foner, Why is there no socialism in the US?

http://webspace.newschool.edu/~nevesr39/Data/Foner_socialism%20US.pdf