Go to ZBib.org.
In the "Cite" bar, enter either the URL for a web source, the ISBN of a book, the DOI or PMID number of an article, or the title of a source. (Numbers sometimes work better than titles.) If you have no luck, you can click Manual Entry and fill in the information.
Your bibliography appears on the page as you add sources. Use the blue bar to choose your citation style.
Delete a reference by running your mousing over it and clicking the X button that appears to the right.
To create an in-text citation or footnote, click the copy button to the right of the source and enter the page number you're citing. Then click Copy Citation and paste it into your document.