APA (7th ed.) Citation

Spitzer, R. L., Williams, J. B. W., & Kroenke, K. (1999). Nine symptom checklist. New York State Psychiatric Institute.

Chicago Style (17th ed.) Citation

Spitzer, Robert L., Janet B. W. Williams, and Kurt Kroenke. Nine Symptom Checklist. New York: New York State Psychiatric Institute, 1999.

MLA (9th ed.) Citation

Spitzer, Robert L., et al. Nine Symptom Checklist. New York State Psychiatric Institute, 1999.