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If I insert the bibliography within the child document, it works perfectly. (therefore it cannot be the Databank). But when I try to render the parent document, I get the following error:

The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

enter image description here

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have you used \usepackage{natbib}? – Mario S. E. May 28 '13 at 0:28
Sir, send me your bank account so that I can transfer you two gillion dollars :). That was exactly the problem, thanks a lot. Post it as an answer so that I can accept it! – bgusach May 28 '13 at 17:44
up vote 3 down vote accepted

By using the natbib package you get access to different \cite commands, such as \citet and \citep.

Simply add it to your preamble by typing:


For more information, please refer to the natbib package documentation

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There you go. Thanks again. – bgusach May 28 '13 at 21:56

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