Stewart, WF; Ricci, JA; Chee, E; Hahn, SR; Morganstein, D (2003). "Cost of Lost Productive Work Time Among US Workers With Depression". JAMA. 289 (23): 3135–3144. doi:10.1001/jama.289.23.3135. PMID12813119.
Stewart, WF; Ricci, JA; Chee, E; Hahn, SR; Morganstein, D (2003). "Cost of Lost Productive Work Time Among US Workers With Depression". JAMA. 289 (23): 3135–3144. doi:10.1001/jama.289.23.3135. PMID12813119.