How many hours of your life have you spent trying to format references at the end of papers or citations within those papers?
If you would like to spend less of your life figuring out if APA style requires a parenthesis here or AMA style requires a comma there, consider taking the time to learn one of the many citation manager tools available.
Citation managers help researchers gather, organize and share references and PDF files found in databases such as PubMed, CINAHL or SCOPUS. You can also use these tools with a word processor to create reference lists and format manuscripts in various styles such as APA, AMA and Vancouver just to name a few.
A selection of these tools can be found at http://www.ohsu.edu/xd/education/library/databases/manage-citations.cfm. Wikipedia has a comparison of these tools [http://en.wikipedia.org/wiki/Comparison_of_reference_management_software]
Learning any of these tools is useful and will save you time. The OHSU Library has a subscription to a citation manager called RefWorks and can provide in-depth training on this web-based tool, as well as support for others.