Adamson, Allen The edge : 50 tips from brands that lead apple, zappos, ge nbc and even Justine bieber/ Allen Adamson. - New York : palgrave, c2013 - 264 p. : ill. ; 24 cm. Subjects--Personal Names: Justine bieber Subjects--Topical Terms: Marketing Dewey Class. No.: 823.914 / ADA