@electronic{speakingjs.com,
   title       = {Speaking JavaScript}, 
   url         = {http://speakingjs.com/es5/},
   biburl      = {https://puma.uni-kassel.de/url/ddbde2ea12df05ad467ac9f68875f349/stephandoerfel},
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@electronic{docstore.mik.ua,
   title       = {O'Reilly's CD bookshelf}, 
   url         = {http://docstore.mik.ua/orelly/},
   biburl      = {https://puma.uni-kassel.de/url/b87ad57a47ff6ae0974acb1bdd0fed75/stephandoerfel},
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@electronic{ebooks.ub.uni-muenchen.de,
   title       = {Java als erste Programmiersprache}, 
   url         = {http://ebooks.ub.uni-muenchen.de/8082/},
   biburl      = {https://puma.uni-kassel.de/url/b2a5b10dd246aa3c56c7135c8fa2ea2c/stephandoerfel},
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