At the time of creating a work, it is necessary to consider its unique identification through various bibliographic identifiers, which guarantee its presence in national libraries, facilitate its commercial distribution and/or achieve a permanent location on the web.
The most common bibliographic identifiers are:
| Legal Deposit (DL) | It guarantees the conservation and dissemination of the bibliographic, sound, visual, audiovisual and digital heritage of Catalonia, through the delivery to the National Library of some copies of the editorial production |
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| International Standard Book Number (ISBN) | It facilitates the transactions of books and other monographic works that are part of the publishing market. |
| International Standard Serial Number (ISSN) | Identify each one of the magazines and other periodicals univocally and unambiguously, regardless of whether they are vouchers or not. |
| identifier URN (Handle / DOI) | Permanently identify digital objects (books/magazines, chapters/articles, etc.), regardless of the server where they are deposited. |
Libraries, Publications and Archives Service of the UPC handles the requests of some identifiers from the books edited by Iniciativa Digital Politècnica. Digital Academic Publications Office , as well as other publications published by various UPC units (basic, functional or other units).
