Name your price for the PDF version of Verbal Behavior

For a very limited time (until May 21, to be exact) we are making PDF version of Verbal Behavior by B. F. Skinner available through Name-Your-Price convention. That means that the minimal price is set at $0.99, and everything you decide to pay above that is a charitable contribution to the B. F. Skinner Foundation. Again, this is for PDF version only.