Proactive law for managers : a hidden source of competitive advantage / George Siedel and Helena Haapio. Siedel, George J. Haapio, Helena. Commercial law United States. Industrial management United States. Competition United States. KF390.B84 S558 2011 340.024658 SIP Includes bibliographical references and index. Burlington, VT : Ashgate Pub. Company, 2011. 2011. 2011 Text xix, 172 p. : eng United States. United States. United States.