This is not from the horses mouth, so to speak (and I'm not comparing Hunter with a Horse), but I would say that the only thing you have to worry about is That Which has Come Before ie: Canon.
You can quote from Canon and use Canon if it adds background the depth to your story. Anything that is Trav Canon can be used, but I think some stuff has been de-Canonised. Dont quote me on this - others will know better than me, but Judges Guild stuff has been de-canonised.
What did youwant to use?
Mike