7Joseph J A, Shukitt-Hale B, Denisova N A, et al. Reversals of age-related decines in neuronal signal transduction, cog-nitive, and motor behavioral deficits with blueberry,soin-ach,or strawberry dietary sup plem entation[J]. J Neurosci, 1999, 19(18): 8114-8121.
8Tsai W C. Determinants and consequences of employee displayed positive emotions[J]. Journal of Management, 2001, 27(5): 497-512.
9Haque A, Sadeghzadeh J, Khatibi A. Identifying potentiality online sales in Malaysia:A study on customer relationships online shopping[J]. Journal of Applied Business Research, 2006, 22(4): 119- 130.