I thought this was unlocked but maybe the time is up.
He links to this summary of the allegations brought by various parties that Turkey is discreetly collaborating with ISIS. Throw out all the ones that come from interviews with people who are actually in ISIS (...) but the rest are interesting. The most important point is right the fuck here: "Turkey Supports ISIS Financially Through Purchase of Oil"
http://www.huffingtonpost.com/david-l-phillips/research-paper-isis-turke_b_6128950.html