Bibliography and citations formatting incorrectly - help!

The Bibliography is not formatting (puncuating) correctly. Some of the
bibliography references have a space after the periodical title (i.e, journal
name) [ex: Journal of Agriculture , 00]. I have tried to make the changes in
the Source Manager by
selecting the Source and Editing the reference, but it does not accept my
changes. I have also tried making the changes in the document itself, but
when I click the Update Citations and Bibliography buttom, it changes my
corrections back to the "puntuated space" in the document. Is there any way
to fix this? I have experimented by deleting the periodical name and typing
it again in the Source Manager Edit box thinking that the cut and paste was
the problem but that didn't work either. Any help is appreciated.