You don't give any detail so I presume you mean how to sell for the most profit?
You can sell to a book dealer, he should offer you 1/2 of retail or you can sell it yourself outright by advertising. You need to find out what the retail value should be then advertise from that point, depending on your asking price.
You can sell it at auction ie: a book auction or other avenue like eBay. You can put a reserve on the book so that it won't sell unless it meets that reserve price.
Lots of ways to go about selling. You need to find one your comfortable with.
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best.........Tim