Burg, Bob Endless referrals : network your everyday contacts into sales / Bob Burg. - 3rd - New york : McGraw-Hill, 2006. - xvi, 286 p: 23 cm English ISBN: 978-1-259-07128-7 Subjects--Topical Terms: SellingBusiness--Communication systemsSocial networks LC Class. No.: 658.85 B91e c2006