Lewis, S. R., Price, A., Walker, K. J., McGrattan, K., & Smith, A. F. (2015). Ultrasound guidance for upper and lower limb blocks. Cochrane Database Syst Rev.

Lewis, Sharon R., Anastasia Price, Kevin J. Walker, Ken McGrattan, und Andrew F. Smith. "Ultrasound Guidance for Upper and Lower Limb Blocks." Cochrane Database Syst Rev 2015.

Lewis, Sharon R., et al. "Ultrasound Guidance for Upper and Lower Limb Blocks." Cochrane Database Syst Rev 2015.