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.
Lua i Stíl Chicago (17ú heag.)Dawson, J., M. Hillsdon, I. Boller, agus C. Foster. Perceived Barriers to Walking in the Neighbourhood Environment and Change in Physical Activity Levels over 12 Months. 2007.
Lua MLA (9ú heag.)Dawson, J., et al. Perceived Barriers to Walking in the Neighbourhood Environment and Change in Physical Activity Levels over 12 Months. 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.