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

  • have you used \usepackage{natbib}? Commented May 28, 2013 at 0:28
  • 1
    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
    Commented May 28, 2013 at 17:44

1 Answer 1


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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