Thank you! I was definitely trying to get that word in there as much as possible. :P 
He used it in 1988 on the Morton Downey jr. Show but he more referred to *"libertarianism"* in the years that followed. I mean libertarianism by the fundamental definition is the same thing as voluntaryism, but I also feel like the word *"libertarian"* has become far too over used by those who are in no way libertarian and it's kind of muddied the waters. So I try to bring in voluntaryism as much as humanly possible. :)