Surplus-value (Marxist exploitation theory)

It seems that talk of worker exploitation is still alive and well even today. What are the best selections of text that shatter exploitation theory, or what are your logical refutations of it? Basically, I want to be able to concisely argue that there isn’t even a worker CLASS and also that individuals are tended to be paid their marginal product.

The best text i could think of is Böhm-Bawerk’s critique

[http://www.econlib.org/library/BohmBawerk/bbCI26.html#Book VI,Ch.III](http://www.econlib.org/library/BohmBawerk/bbCI26.html#Book VI,Ch.III)

Also Murphy has a great short artical on the subject.

http://mises.org/daily/1680