Forum:SH Archive/Contradicting Books

Wookieepedia &gt; Senate Hall &gt; 

I'm new here so I don't know if this has been addressed yet. What do we do when two supposedly reliable sources contradict eachother? For example: I was just looking through the "New Essential Chronology" and Luke and Mara represented the new republic on a mission to the remains of the outbound flight. Yet in the book that tells that story (survivors quest) it said that they were not representing the NR but only the Jedi Order. Which source should I go with?