Ussery, E. N., Carlson, S. A., Whitfield, G. P., Watson, K. B., Berrigan, D., & Fulton, J. E. (2017). Walking for Transportation or Leisure Among U.S. Women and Men — National Health Interview Survey, 2005–2015. MMWR Morb Mortal Wkly Rep.

Ussery, Emily N., Susan A. Carlson, Geoffrey P. Whitfield, Kathleen B. Watson, David Berrigan, و Janet E. Fulton. "Walking for Transportation or Leisure Among U.S. Women and Men — National Health Interview Survey, 2005–2015." MMWR Morb Mortal Wkly Rep 2017.

Ussery, Emily N., et al. "Walking for Transportation or Leisure Among U.S. Women and Men — National Health Interview Survey, 2005–2015." MMWR Morb Mortal Wkly Rep 2017.