The ISBN uniquely identifies book publications - whether printed or digital. Online editions are also assigned their own ISBN.

You can request an ISBN free of charge: Please contact us at beschaffung.bibliothek@hs-duesseldorf.de​.

For print publications, we ask that you provide six complimentary copies for archiving and to fulfill the legal deposit requirement. 

These are distributed as follows:

• Two copies will be added to the University Library's collection.
  
• Two copies are sent to the German National Library as legal deposit copies in accordance with §14 of the „Gesetzes über die Deutsche Nationalbibliothek (DNBG)“.
• One copy is sent to the University and State Library (ULB) in Düsseldorf as a legal deposit copy in accordance with the „Gesetzes über die Ablieferung von Pflichtexemplaren in Nordrhein-Westfalen (Pflichtexemplargesetz Nordrhein-Westfalen)“
• One copy  requires the University Library in order to list the publication in the VLB (Directory of Available Books).​

For this, we also need the following information from you:

• what the retail price of the publication will be
• where you can request or purchase copies​

For ongoing publications such as book series or journals, we are happy to apply for an ISSN on your behalf through the ISSN Center Germany.

Online journals can also be assigned their own ISSN. Print and digital editions are assigned different ISSNs, even if they share the same title.

You can apply for an ISSN free of charge: Contact us at beschaffung.bibliothek@hs-duesseldorf.de. Please provide the title and - for online publications - the parent URL. Applications are typically processed within 10 days.​