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Sometimes I want to refer (using \ref) a \label from some other tex file. What is the right way to do it?

(It's, of course, possible to \include all files in one and then use \includeonly — but it breaks e.g. page and section numbering.)

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marked as duplicate by lockstep, Papiro, Svend Tveskæg, Zarko, Kurt Nov 26 '15 at 19:06

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up vote 26 down vote accepted


Referring to labels in other documents

When producing a set of inter-related documents, you’ll often want to refer to labels in another document of the set; but LaTeX, of its own accord, doesn’t permit this.

So the package xr was written: if you say


will load all the references from volume1 into your present document.


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The package looks for the aux file, so it does not work in all settings and, more importantly, without a full document. (Which is fair, but noteworthy for unwary readers.) – Raphael Nov 7 '13 at 16:38

Use package xr.

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