References for "Mental health problems in the workplace"
Barkley RA. Attention Deficit Hyperactivity Disorder in Adults: The Latest Assessment and Treatment Strategies (Jones and Bartlett Publishers, 2010).
De Graaf R, et al. "The Prevalence and Effects of Adult Attention-Deficit/Hyperactivity Disorder (ADHD) on the Performance of Workers: Results from the WHO World Mental Health Survey Initiative," Occupational and Environmental Medicine (Dec. 2008): Vol. 65, No. 12, pp. 835–42. www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=18505771
Greenberg PE, et al. "The Economic Burden of Anxiety Disorders in the 1990s," Journal of Clinical Psychiatry (July 1999): Vol. 60, No. 7, pp. 427–35.