Kurt Blass, “Treating Depression With Cannabinoids,” Cannabinoids 3, issue 2 (2008): 8-10.

Prohibitionists sometimes claim marijuana causes depression and scoff at marijuana as a treatment for depression. Here a Viennese doctor describes repeated clinical successes using oral THC to treat depression. See also, “Animal research highlights a therapeutic potential of cannabinoids for the treatment of depression,” above)
Full text available for free at http://www.cannabis-med.org/english/journal/en_2008_02_2.pdf