[1] D.Whetten.What Constitutes a Theoretical Contribution[J]. Academy of Management Review,1989,(14):490-495. [2] A.S.Tsui,J.L.Pearce,A.M.Tripoli.Alternative Approaches to the Employee-organization Relationship:Does Investment in Employees Pay off ?[J]. Academy of Management Journal,1997,40 (5):1 089-1 121.