K Ball, A MacFarlane, D Crawford, G Savige, N Andrianopoulos and A. Worsley
Health Education Research 24 ( 3 ): 496 - 506 , 2009
V. J Cleland, K Ball, J Salmon, A. F Timperio and D. A. Crawford
Health Education Research 25 ( 2 ): 268 - 281 , 2010
M Teychenne, K Ball and J. Salmon
Health Education Research 25 ( 4 ): 632 - 644 , 2010