Debugging bibtex

Question

I am using a home-made thesis template available here. The example is using plain bibliography style, I need apa though. After writing a few pages of introduction and changing the style, I get the following errors (one per cit

! Undefined control sequence.
<argument> \protect \astroncite 
                                {Akelof}{2003}
l.3 ...m[\protect\astroncite{Akelof}{2003}]{ake03}

! Undefined control sequence.
<argument> \protect \astroncite 
                                {Akerlof and Shiller}{2009}
l.9 ...ncite{Akerlof and Shiller}{2009}]{akeshi09}

! Undefined control sequence.
<argument> \protect \astroncite 
                                {Baker and Wurgler}{2006}
l.14 ...ncite{Baker and Wurgler}{2006}]{Baker2006}

etc.

How can I figure out what is wrong? Apa style works in all other documents, so I guess there must be something wrong with this style file...

Answer 1

Schoolboy error: I forgot to include \usepackage{natbib} in the document.