Bloomberg, citing a source, reported that Barnes & Noble (NYSE:BKS) is in talks with the U.K.’s Waterstones Booksellers to sell Nook digital devices outside the U.S. for the first time.Waterstones, which is a privately owned company, is the largest bookstore chain in Britain with about 300 stores.Barnes & Noble (NYSE:BKS) has potential upside of 40.1% based on a current price of $11.9 and an average consensus analyst price target of $16.67.