I manage bibliography lists and automatically create citations using BibTeX
a companion program for the LaTeX text-processing system.
LaTeX, BibTeX and instructions can be found on
CTAN: the Comprehensive TeX Archive Network
Extensive bibliography lists in BibTeX format are maintained on many Internet
sites such as the
Networked Computer Science Technical Reports Library
When forced to use Microsoft Word I have developed
a set of BibTeX styles
that create Microsoft Word RTF files.
More information is also available from
Dana Jacobsen's Survey of Bibliographic Tools.
Some other tools that you may wish to examine are
ProCite,
EndNote,
Reference Manager,
RefViz, and
WriteNote.