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Please help! My thesis bibliography is formatted in a modified Harvard-esque style (natbib). My examiners have requested that multiple papers by the same first author are cited in date order, but I can't find a way to make this happen.

Does anyone know of a field code I can add to the .sty file that will work?

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Welcome to TeX.SE! It would be helpful if you provided a bit more information about your TeX setup and, in particular, the bibliography style file (with filename extension .bst) you use. Please also confirm that you use the natbib rather than the harvard citation package -- the title of your posting is a bit ambiguous in this regard. A separate issue: I assume you've already done so, but do verify that your university really is requiring you to use this rather unusual sorting scheme. – Mico Apr 19 '12 at 15:50
Is biblatex an option for you?? – Marco Daniel Apr 19 '12 at 16:12

As Mico pointed out, it's not entirely clear what you want to achieve exactly but maybe something along the lines of


is already what you need. Biblatex is relatively drop-in. Just put your \bibliography{...} in the preamble and \printbibliography where the thing should ultimately go in the document.

Personally I use


in my thesis BTW. Especially the maxnames option might need some tweaking according to your field. texdoc biblatex is also quite comprehensive in this regard.

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