What is a citation? A citation....
The ProQuest RefWorks is a premier reference management service that supports the needs of students, faculty and librarians. With a refined user experience, full-text management, collaboration and other features you’d expect from a reference management solution, RefWorks enables students and faculty to have a more efficient and reliable process for producing the best research papers and grants. Libraries are able to offer this powerful service and have full administrative controls and analytics that provide a consistent source of patron and content usage.
EndNote is reference management software with features to --
Landmarks Citation Machine: Choose the appropriate style (APA, MLA, etc.) and fill in the forms to create citations for any format.
OWL Purdue Online Writing offers APA, MLA formatting and style guide.
Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources. It lives right where you do your work—in the web browser itself.