Snowden, J. M., Tilden, E. L., Snyder, J., Quigley, B., Caughey, A. B., & Cheng, Y. W. (2015). Planned Out-of-Hospital Birth and Birth Outcomes. N Engl J Med.

Snowden, Jonathan M., Ellen L. Tilden, Janice Snyder, Brian Quigley, Aaron B. Caughey, e Yvonne W. Cheng. "Planned Out-of-Hospital Birth and Birth Outcomes." N Engl J Med 2015.

Snowden, Jonathan M., et al. "Planned Out-of-Hospital Birth and Birth Outcomes." N Engl J Med 2015.