A citation style dictates the information necessary for a citation and how the information is ordered, as well as punctuation and other formatting.
A bibliography lists citations for all of the relevant resources a person consulted during his or her research.
In an annotated bibliography, each citation is followed by a brief note—or annotation—that describes and/or evaluates the source and the information found in it.
A works cited list presents citations for those sources referenced in a particular paper, presentation, or other composition.
An in-text citation consists of just enough information to correspond to a source's full citation in a Works Cited list. In-text citations often require a page number (or numbers) showing exactly where relevant information was found in the original source.
You need to cite when:
When in doubt, err on the side of caution, and cite.
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