Many students and scholars use these tools to "grab" a citation and store it with their research materials for reference and for possible inclusion in a bibliography or cited sources section of a paper.
Just be aware that the citations you copy are often slightly flawed and will need to be checked before adding to your final bibliography!
Seton Hall Online Writing Lab the OWL, is designed to assist students, faculty, and staff with their writing. SHU restricted
The Owl at Purdue (writing & citation guide)
Research & Documentation online: includes citation guides and sample papers for MLA, APA, Chicago, and CSE styles
How to cite online sources also includes comprehensive resources for bloggers