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   title       = {Welcome to ESTA - the Official U.S. Government Web Site}, 
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   biburl      = {https://puma.uni-kassel.de/url/c48d7c5671ff52a41924d455f4f079df/benz},
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@electronic{www.prepaidreviews.com,
   title       = {Best Rated Pay as You Go Phone Plans | Prepaid Reviews}, 
   url         = {http://www.prepaidreviews.com/bestrated.html},
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@electronic{flowingdata.com,
   title       = {Showing the Obama-Clinton Divide in Decision Tree Infographic | FlowingData}, 
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@electronic{youtube.com,
   title       = {YouTube - The Machine is Us/ing Us (Final Version)}, 
   url         = {http://youtube.com/watch?v=NLlGopyXT_g},
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