Dawson, J., Hillsdon, M., Boller, I., & Foster, C. (2007). Perceived barriers to walking in the neighbourhood environment and change in physical activity levels over 12 months. BMJ Group.

Dawson, Jill, Melvyn Hillsdon, Irene Boller, and Charlie Foster. Perceived Barriers to Walking in the Neighbourhood Environment and Change in Physical Activity Levels Over 12 months. BMJ Group, 2007.

Dawson, Jill, Melvyn Hillsdon, Irene Boller, and Charlie Foster. Perceived Barriers to Walking in the Neighbourhood Environment and Change in Physical Activity Levels Over 12 months. BMJ Group, 2007.