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Can someone please help me out of this problem? My references now suddenly appear as (21) instead of the usual (Ferrero, 1997). I don't know what I did wrong. I would really appreciate a quick response. Thank you

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You have probably changed your citing style from author-year to numeric. What do you use to handle your bibliography? biblatex? natbib+bibtex? A minimal working example (MWE) could help. – Corentin Jan 9 '13 at 11:21

Using the package natbib you would get the references by the following MWE

\usepackage{lipsum} %just to get some text

\lipsum[1] \citep{Ferrero:1997} \lipsum[2] \citet{Doe:1999}.


\bibitem[Ferrero, 1997]{Ferrero:1997}
Fererro, X.Y., 1997. text of the rest of the reference.

\bibitem[Doe, 1999]{Doe:1999}
Doe, J., 1999. another reference


The key in this case is in the \bibitem format. So depending on your own setup this can be used as a template for your referencing. An MWE of your document as suggested by Corentin would be useful to provide more details. Note that I used both the passive \citep and active \citet ways to reference in the text in the example.

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