I think this is a good resource too
http://www.drgeorgesimon.com/drsimonsblogarchives.html
and the book "in Sheep's clothing" of doctor Simon

In that book I found written in the best way the difference between a passive-aggressive personality that was described and a Covert aggressive personality that has the place here in APD field. In that way there will be no worry anymore for who started the thread :-)