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In this system, an elderly woman's description of her wedding day from many decades before is a primary source; her granddaughter's plain repetition of that information to her schoolteacher is considered secondary by genealogists, and if the schoolteacher goes home that evening and writes down what the granddaughter said, then the schoolteacher ...
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.
Wikipedia editors have created custom Google search engines to help find sources on websites that Wikipedia editors have determined are generally more reliable. Several general search engines exist for more academic material, particularly scholarly articles, although some content will be behind a paywall: examples are Google Scholar , BASE and ...
A short citation is an inline citation that identifies the place in a source where specific information can be found, but without giving full details of the source. Some Wikipedia articles use it, giving summary information about the source together with a page number. For example, <ref>Rawls 1971, p. 1.</ref>, which renders as Rawls 1971, p. 1.
The field of system identification uses statistical methods to build mathematical models of dynamical systems from measured data. [1] System identification also includes the optimal design of experiments for efficiently generating informative data for fitting such models as well as model reduction.
A third-party source from one article may be treated as an auxiliary source in another, because the focus has changed. [6] Generally, any source that does not qualify as a reliable third-party source is grouped in this category. The use of these raw, first-hand, or out-of-date sources lends itself to inaccurate reporting, undue weight, and ...
You should always try to use the best possible source, particularly when writing about living people. These are general guidelines, but the topic of reliable sources is a complicated one, and is impossible to fully cover here. You can find more information at Wikipedia:Verifiability and at Wikipedia:Reliable sources.
Source material must be published, on Wikipedia meaning made available to the public in some form. [f] Unpublished material is not considered reliable. Use sources that directly support the material presented in an article and are appropriate to the claims made. The appropriateness of any source depends on the context.