Citation management tools help you manage your research, collect and cite sources, and create bibliographies in a variety of citation styles. Each one has its strengths and weaknesses, but any are easier than doing it by hand!
Zotero: Free program that works in your browser to keeps copies of pdfs and other research materials you find on the web: permits tagging, notation, full text searching of your library of resources, works with Word, and has a free cloud backup service. Formats your bibliography and footnotes in many style sheets.
RefWorks - free for UC Berkeley users. It allows you to create your own database by importing references from article databases and formatting footnotes and bibliographies. Use the RefWorks New User Form to sign up.
It's always good to double check the formatting -- sometimes the software doesn't get it quite right.
Using APA 6th? Purdue has produced this very handy quick guide. The fulltext of APA 6th is not available online, but we do have print copies in the EdPsych Library in reference and short term reserve at BF76.7 P83 2010