Below are some general resources for citations and citation help. Check the list on the left for specific citation style guides!
Academic Integrity - check out our Academic Integrity Portal to find resources to help with plagiarism
RefWorks - will format your citations into any of over 3,000 styles and help you generate your list of references
Purdue Online Writing Lab - How to Use Research - many useful tips for using research in your papers, avoiding plagiarism, etc.
Also, check the subject guide for your department for links and tips specific to your field.
EBSCO (including OneSearch), Proquest, Ebrary, and EBL all include features to give you the citation for a particular article or ebook within their search interface. Many other publisher sites (ScienceDirect, Wiley, etc.) may also have this feature. Ask a library staff member if you need help finding the cite button. Keep in mind, their citations may not be correct (especially with regard to capitalization) so check what they give you against the official rules.
A screenshot from OneSearch in EBSCO highlighting the 'cite' button: