Comorbidity of DSM-III-R major depressive disorder in the general population: Results from the US National Comorbidity Survey
British Journal of Psychiatry
http://www.ncbi.nlm.nih.gov/pubmed/?term=Comorbidity%20of%20DSM-III-R%20major%20depressive%20disorder%20in%20the%20general%20population%3A%20Results%20from%20the%20US%20National%20Comorbidity%20Survey.