Zotero doesn't recognize ISBN or e-ISBN number

I want to import a publication by using the ISBN or eISBN nr. Somehow Zotero doesn't recognize the number. Any suggestions?
isbn 978-94-90186-89-0
e-isbn 978-94-90186-88-3
  • Zotero queries library catalogs for ISBNs -- not all items with an ISBN are in library catalogs (and there is no centralized database for ISBN metadata). E.g. that example looks like it's both quite recent and self-published
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