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Ritson M. When it comes to social media, Coke is it! // M. Ritson Marketing Week Mag. URL: http://www.marketingweek.co.uk/sectors/food-and-drink/soft-drinks/when-it-comes-to-social-media-coke-is-it!/3025201.article (дата обращения: 20.07.2013).
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Sheffield police use Twitter in crowd control // Government Computing. URL: http://bluelight.governmentcomputing.com/features/2012/jan/09/sheffield-police-mobile-twitter (дата обращения: 20.07.2013).
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