Quellenverweis
Wieso erscheint bei meinen Verweisen immer dieses; "o. J." ?
(vgl. CKW Geschäftsbericht 2017/18.pdf, o. J.)
(vgl. CKW Geschäftsbericht 2017/18.pdf, o. J.)
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bwierniko. J. Is the German term for “no date”. It looks like you are citing a PDF attachment file directly, rather than a proper Zotero item with all of the bibliographic metadata. You always want to be working with proper Zotero items. See https://zotero.org/support/getting_stuff_into_your_library for details on how to add items to your library.