APA (7th ed.) Citation

Valderas, J., Starfield, B., Forrest, C., Sibbald, B., & Roland, M. (2009). Ambulatory care provided by office-based specialists in the United States.

Chicago Style (17th ed.) Citation

Valderas, J., B. Starfield, C. Forrest, B. Sibbald, and M. Roland. Ambulatory Care Provided by Office-based Specialists in the United States. 2009.

MLA (9th ed.) Citation

Valderas, J., et al. Ambulatory Care Provided by Office-based Specialists in the United States. 2009.