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Ulrich's Periodicals Directory (ISSN 0000-0175, and ISSN 0000-2100) is the standard library directory and database providing information about popular and academic magazines, scientific journals, newspapers and other serial publications. [1]
Academic Search Complete was first published in 2007 as Academic Premier. It is an indexing and abstracting service, accessible via the World Wide Web . Coverage includes more than 8,500 full-text periodicals, including more than 7,300 peer-reviewed journals.
It's a good idea to start with a search engine, as it will have the most comprehensive coverage. Besides, many of the online databases listed below include free full text. If you're looking for a source that isn't a journal article, try the Find your Source guide. For books, you can also use Special:BookSources to search by ISBN.
The terms "free", "subscription", and "free & subscription" will refer to the availability of the website as well as the journal articles used. Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required).
The ISSN refers to the particular publication, not to a specific issue (or date) of that publication. The ISSN is used to help establish the publication as a Wikipedia reliable source. For a publication with the ISSN 1234-5678, use {{ISSN|1234-5678}}. The template supports up to 9 ISSNs.
In any context where you need to show an ISSN linked to a Worldcat search, but where the inclusion of the "ISSN " prefix would be distracting, or where you need to provide both the ISSN (print) and eISSN (web/online/digital) for a publication, you can use {{}} to generate the needed markup.
The Publisher Item Identifier (PII) is a unique identifier used by a number of scientific journal publishers to identify documents. [1] It uses the pre-existing ISSN or ISBN of the publication in question, and adds a character for source publication type, an item number, and a check digit.
An ISSN is particularly helpful in the following circumstances (especially when the ISSN is linked, using template or parameter detailed below): In a citation to a periodical that is relatively unknown, as the ISSN can help in verifying the existence and reliability of the journal and procuring a copy of one of its issues to verify the content.