Many of the article databases CUA subscribes to are accessible through Google Scholar.
If you are off campus, please make sure to set the preferences so that Google will show you the resources that Catholic University provides:
On the search result page, the link "ViewIt@CatholicU" will bring you the full text of the article from our subscribed databases.
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 sources. Use these references in writing papers and automatically format the paper and the bibliography in seconds with tools provided by RefWorks. Please see RefWorks at Catholic University for more information.
These books tell and show you the APA style rules. Also Purdue OWL provides online APA style guides.