Information sources are often classified as physical (print, analog) versus online (electronic, digital,) text versus audio-video and book versus journal.
Here are some common information source types with descriptions of how current their information usually is, what kind of information is contained in them, and where to find them.
Gray literature is a huge category that encompasses a wide variety of documents that have not been published in the traditional sense. Gray literature includes:
Certain kinds of gray literature can be found in databases. Others are best found by searching the web.
Sometimes it is difficult to ascertain the author or organization responsible for the information, which can make gray literature may be difficult to cite.
What about video? What about the Web? Neither is a source type; video is a format, and the Web is a delivery method. You can find a video format textbook. You can find a scholarly article on the web. It does not necessarily change what kind of information is contained in it, who is responsible for that information, what kind of quality control is behind it, or how current that information is.
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