As I suggest in my blog response, what they could have done (or could do now) is release the notes as a downloadable supplement. Of course, which citation format would be used? I know that the social sciences model (author last name and date: page number) is considered crap in many historical circles, so I'd suggest they use the full-blown versions (or barring that at least use a parenthetical citation model ["cited text..." author last name date: page number] presented as endnotes). I seriously doubt that there's much preventing this, and it would certainly help derail Price's claims.