An explanation of the Notes & Bibliography system from the Chicago Manual of Style Online (16th ed.)
This citation guide provides links to the major style guides and provides examples of the most common types of citations. It also has links to citation software that will help you store, take notes, and cite your sources. The top tools are listed here as well.
Here are some additional tools to help you cite. They do not have as many options as the full Zotero application. Generally, these require manual input of text, but some can search by url, doi, or isbn to retrieve the data. These tools create the order & punctuation for you.
From JSTOR's Research Basics Course