https://www.mediapost.com/publications/article/198503/walking-dead-broadcast-bites-into-network-ad-eros.html
Walking Dead: Broadcast Bites Into Network Ad Erosion, AMC Leads Cable's Momentum - 04/19/2013
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https://www.openpr.com/news/75595/exercise-walking-leads-top-10-in-sports-participation-for-2008.html
Press release - National Sporting Goods Association - Exercise Walking Leads Top 10 in Sports Participation for 2008 - published on openPR.com
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