Giving credit to the original author by citing sources is the only way to use other people's work without plagiarizing. But there are a number of other reasons to cite sources:
RefWorks is a web-based bibliography and
database manager that allows you to create your own personal database
by importing references from text files or online databases and other
various sources. You can use these references in writing papers and
automatically format the paper and the bibliography in seconds. Go to Refworks. Ask your librarian for assistance.