The natbib package is a reimplementation of the LATEX \cite command, to work with both author-year and numerical citation. It is compatible with the standard bibliographic style files, such as plain.bst, as well as with those for harvard, apalike, chicago, astron, authordate, asd of couse natbib.
CITATION STYLE
Load, L., & Jones, B. (2007). Reference sheet for natbib usage, (1990).
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