Going to need you to offer up some examples, given our Socialist friends come at us from every direction imaginable.
In general, the ideal of Libertarianism revolves around individual liberty. Hell, we have a faction of Libertarian Socialists - so if you want to really get at the meat of the matter with respect to the State, then these sorts of folks would be a tremendous source to build a base on how to address Statist Socialists with a Libertarian perspective.
That being said - it's really a matter of understanding the argument from the "opposition" than it is "referencing a source".
Right off the bat, Mises.org is exceptional. But Mises is just an easy source for accumulating information, but there is no quick response resource.
In all honesty, the Left relies on predetermined "Talking Points", whereas Libertarianism allows for an assortment of viewpoints. So I hear your request for a predetermined "Libertarian response to X"... but honestly, research a lot of works from Classical Liberals, Libertarians, Conservatives, and everything inbetween. This will give you all of the variable responses you desire.
Personally - I listen to the following:
I'm Conservative and Libertarian - so take that for what you will. Anyways, exposure to all angles that arise from Classical Liberalism (Libertarianism) will give you a strong, solid defense on everything.