Nordlund, A., & Garvill, J. (2003). Effects of values, problem awareness, and personal norm on willingness to reduce personal car use. Journal of Environmental Psychology, 23(4), 339-347.

Matthies, E., Kuhn, S., & Klöckner, C. (2002). Travel mode choice of women: The result of limitation, ecological norm, or weak habit?. Environment and Behavior, 34(2), 163-177. doi:10.1177/0013916502034002001.

Klöckner, C., & Matthies, E. (2004). How habits interfere with norm-directed behaviour: A normative decision-making model for travel mode choice. Journal of Environmental Psychology, 24(3), 319-327. doi:10.1016/j.jenvp.2004.08.004.

Haustein, S., Klöckner, C., & Blöbaum, A. (2009). Car use of young adults: The role of travel socialization. Transportation Research Part F: Traffic Psychology and Behaviour, 12(2), 168-178. doi:10.1016/j.trf.2008.10.003.

Thogersen, J., & Ölander, F. (2006). To What Degree are Environmentally Beneficial Choices Reflective of a General Conservation Stance?. Environment and Behavior, 38(4), 550-569.

Eriksson, L., Garvill, J., & Nordlund, A. (2006). Acceptability of travel demand management measures: The importance of problem awareness, personal norm, freedom, and fairness. Journal of Environmental Psychology, 26(1), 15-26. doi:10.1016/j.jenvp.2006.05.003.

Heath, Y., & Gifford, R. (2002). Extending the theory of planned behavior: Predicting the use of public transportation. Journal of Applied Social Psychology, 32(10), 2154-2185. doi:10.1111/j.1559-1816.2002.tb02068.x.

Cairns, S., Sloman, L., Newson, C., Anable, J., Kirkbride, A., Goodwin, P. (2008). Smarter choices: Assessing the potential to achieve traffic reduction using 'Soft measures'. Transport Reviews, 28(5), 593-618.