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Search for periodical titles in the Wikipedia Library database index at The Wikipedia Library/A–Z; Check the list of online newspaper archives (some of which are free to access) or the list of free English newspaper sources. There are also other digitized-newspaper archives, particularly for older articles, that may be available.
The Wikipedia Library is an initiative to help Wikipedians get access to subscription or paid sources to improve Wikipedia articles. Editors can apply for access to databases, request specific sources, or request help with research.
Wikipedia, like many institutions, has its own lexicon. Wikipedia does not use these terms exactly like academics use them. There are at least two ways in which the term secondary source is used on Wikipedia. This page deals primarily with the classification of reliable sources in terms of article content.
The ID number might be an ISBN for a book, a DOI (digital object identifier) for an article or some e-books, or any of several ID numbers that are specific to particular article databases, such as a PMID number for articles on PubMed. It may be possible to format these so that they are automatically activated and become clickable when added to ...
For a source to be added to this list, editors generally expect two or more significant discussions about the source's reliability in the past, or an uninterrupted request for comment on the source's reliability that took place on the reliable sources noticeboard. For a discussion to be considered significant, most editors expect no fewer than ...
The Wikipedia List of online newspaper archives – Very extensive and useful list of websites to find sources at; The Wikipedia List of free online resources page – provides many resources for source searching; The Wikipedia List of search engines article – provides a list of additional search engines that can be utilized.
Although material that is from external websites is a common reference source, Wikipedia has no preference for online sources. If your source is a book, journal, magazine, newspaper article, documentary or another source, then you would place identification information about that source between the ref tags.
The DOI system is an international standard developed by the International Organization for Standardization in its technical committee on identification and description, TC46/SC9. [39] The Draft International Standard ISO/DIS 26324, Information and documentation – Digital Object Identifier System met the ISO requirements for approval.