Preston, P., A. Kerr, and A. Cawley,
"Digital media sector innovation in the knowledge economy: rethinking knowledge inputs and policies",
Information, Communication & Society, vol. 12, issue 7, pp. 994-1014, 2009.
Gebel, K., B. Reger-Nash, K. Leyden, and A. Bauman,
"Does the environment moderate the impact of a mass media campaign to promote walking?",
American Journal of Health Promotion, vol. 26, issue 1, pp. 45-48, 2011.