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This question already has an answer here:

I have a .bib file as following:

%% This BibTeX bibliography file was created using BibDesk.
%% http://bibdesk.sourceforge.net/
%% Saved with string encoding Unicode (UTF-8) 

    Author = {Marcu, Daniel},
    Date-Added = {2013-02-12 04:56:47 +0000},
    Date-Modified = {2013-02-12 04:56:47 +0000},
    Publisher = {MIT Press},
    Title = {The theory and practice of discourse parsing and summarization},
    Year = {2000}}

My Latex file:

\documentclass{article} % For LaTeX2e





However, I always got the warning:

Author undefined for citation`marcu2000theory' (natbib) on page 1

Could someone point out the mistake?

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marked as duplicate by Speravir, Adam Liter, Heiko Oberdiek, barbara beeton, Werner Mar 30 '14 at 5:28

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 8 down vote accepted

Use natbib's replacement of plain style, plainnat.bst. And to have numerical citations, use the numbers options.

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actually, it seems not need the numbers options. I now can work well. Thanks! – Xing Shi Feb 12 '13 at 8:31

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