I'm seeing two for and two against of the interested parties.  Hardly a "consensus".  If other users want to chime in here and push it one way or the other that'd be fine.  I say leave it open a while longer and see if anyone wants to chime in.  Anyway, if you are going to include it, cite it directly to Dummett, and don't use Hersh.  I think the actual Dummett source is given in one of the above threads.