Citing Rowling

[becca_price]

I want to make a reference to the Potterverse in a paper I'm writing:
specifically, I'm describing clinical depression as how I imagine it
feels to run into a dementor. I need to cite the reference. I
currently say "Harry Potter, dementors, and all other references to
that universe were developed by J. K. Rowling" - do I need to say "and
are the property of Scholastic Books"? do I give copyright and a date?
if so, should the date be the first book or the most recent one? is
"dementor" one of the words that have been specifically copyrighted or
trademarked? 

thanks,
 
Becca