This resource is the online version of the 16th edition and the 15th edition of the print manual. It also includes a "Quick Guide" for basics in citing sources, and a Q&A section. The main "Chicago Manual of Style" link provides access to the sections of the book through the table of contents. The index provides links to the specific pages in the online resource.
Use RefWorks to keep track of resources you find in your research, and to create your bibliography when finished.