The ISSN identifiers are assigned at the request of publishers or third parties. ISSN are assigned either by ISSN National Centres for resources handled by publishers located in their respective countries or by the ISSN International Centre for publishers based in countries without a National Centre, for international organizations, or for multinational publishers having a specific agreement with the ISSN International Centre [see section 8. You are a publisher, or a third party requesting an ISSN assignment]. The ISSN International Centre and the 89 ISSN National Centres form together the ISSN Network.