Macpherson, A. K., Macarthur, C., To, T. M., Chipman, M. L., Wright, J. G., & Parkin, P. C. (2006). Economic disparity in bicycle helmet use by children six years after the introduction of legislation. BMJ Group.

Macpherson, A K., C. Macarthur, T M. To, M L. Chipman, J G. Wright, and P C. Parkin. Economic Disparity in Bicycle Helmet Use By Children Six Years After the Introduction of Legislation. BMJ Group, 2006.

Macpherson, A K., et al. Economic Disparity in Bicycle Helmet Use By Children Six Years After the Introduction of Legislation. BMJ Group, 2006.