Spitzer RL, Kroenke K, Williams JB (1999). "Validation and utility of a self-report version of PRIME-MD: the PHQ primary care study. Primary Care Evaluation of Mental Disorders. Patient Health Questionnaire". JAMA. 282 (18): 1737–44. doi:10.1001/jama.282.18.1737. PMID10568646.
Spitzer, Robert L.; Kroenke, Kurt; Williams, Janet B. W.; Löwe, Bernd (2006). "A Brief Measure for Assessing Generalized Anxiety Disorder". Archives of Internal Medicine. 166 (10): 1092–7. doi:10.1001/archinte.166.10.1092. ISSN0003-9926. PMID16717171.
Karasek, R.; et al. (1998). "The Job Content Questionnaire (JCQ): an instrument for internationally comparative assessments of psychosocial job characteristics". Journal of Occupational Health Psychology. 3 (4): 322–355. doi:10.1037/1076-8998.3.4.322. PMID9805280.
Spitzer RL, Kroenke K, Williams JB (1999). "Validation and utility of a self-report version of PRIME-MD: the PHQ primary care study. Primary Care Evaluation of Mental Disorders. Patient Health Questionnaire". JAMA. 282 (18): 1737–44. doi:10.1001/jama.282.18.1737. PMID10568646.
Spitzer, Robert L.; Kroenke, Kurt; Williams, Janet B. W.; Löwe, Bernd (2006). "A Brief Measure for Assessing Generalized Anxiety Disorder". Archives of Internal Medicine. 166 (10): 1092–7. doi:10.1001/archinte.166.10.1092. ISSN0003-9926. PMID16717171.
Karasek, R.; et al. (1998). "The Job Content Questionnaire (JCQ): an instrument for internationally comparative assessments of psychosocial job characteristics". Journal of Occupational Health Psychology. 3 (4): 322–355. doi:10.1037/1076-8998.3.4.322. PMID9805280.