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  • × author_ss:"Lüdtke, H."
  1. Lüdtke, H.: Ende der Internet Public Library (2015) 4.07 
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  2. Lüdtke, H.: Taking the reference desk to cyberspace : Internet-Bibliotheken und Online-Auskunftsdienste / im Mittelpunkt die Internet Public Library (USA) (2001) 4.07 
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  3. Lüdtke, H.: Secret Patrons, Invisible Users : Digital Reference @ Your Library: Fundstücke einer nicht nur virtuellen Erkundung in den USA (2004) 4.07 
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