You mention interest specifically in research on a Gestalt approach to depression. There is a good summary of that at < http://www.g-g.org/pen >. Once there click on the link to Les Greenberg's article. He summarizes the research relevant to depression. Aside from that, I would suggest you consult the APA's PsychInfo database. You will have to wade through references to Gestalt that go all the way back to about 1887, but what else would you like to do on a rainy day!? :-)