Zotero is a free citation/reference resource management software. It can be run as a stand-alone application on your computer or managed online. Once you've installed the browser extension, Zotero automatically interprets data on a web site, and with a click, adds a record to your library.
Click on items from:
The Olive Kettering Library catalog,
OhioLink catalog,
Articles from Academic Search Complete, or
JSTOR
...and Zotero creates a citation record of the item along with a direct URL link and available PDF files.
MLA Handbook for Writers of Research Papers by 
Publication Manual of the American Psychological Association by 
Mastering APA Style by 
Scientific Style and Format by 
The Chicago Manual of Style by