Formatting in-text citation brackets (paranthesis)

hi 

when i update citations and biblography in word , i face to copy of in-text citation like this:

 (Delone and McLean 2003; Roca, Chiu et al. 2006; Teo, Srivastava et al. 2008)(Delone & McLean, 2003; Roca, et al., 2006; Teo, et al., 2008) (Delone and McLean 2003; Roca, Chiu et al. 2006; Teo, Srivastava et al. 2008)(Delone & McLean, 2003; Roca, et al., 2006; Teo, et al., 2008)

working with X4 and word 2007

what should i do to handel this?

 regards