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While I use \citet{Titterington} and I use \bibliographystyle{unsrt} which all websites say is supposed to produce a citation in the main body like Titterington[1], for me produces a citation in the main body that looks like (author?)[1].

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migrated from May 3 '11 at 9:03

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Found the solution from here:

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I suppose, you are using natbib use \usepackage[numeric]{natbib}. If it doesn't help, create a complete example.

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I think it should be \usepackage[numbers]{natbib}. – lum May 27 at 13:57

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