[NTG-context] Bibliogrraphy MKIV sort does NOT work

Hans, Could we (you and I) fix sort= so that we can make choices? Default sort=author does NOT function. As a matter of fact there seems to be no sort available. Also, can someone point me to the files required so that we (I) could write code to chose biblio style files for reference list eg econometric, elsevier, AEA, etc.