Psychometric Evaluation and Normative Data for the Depression, Anxiety, and Stress Scales-21 (DASS-21) in a Nonclinical Sample of U.S. Adults. - Sinclair, Samuel Justin; Siefert, Caleb J.; Slavin-Mulford, Jenelle M.; Stein, Michelle B.; Renna, Megan; Blais, Mark A. (Evaluation & the Health Professions, 2012)