Full text of the 17th and 18th editions of the Chicago Manual of Style, including quick guide, questions and answers, and additional tools.
When doing research at the graduate level, it is important to be diligent about keeping track of your sources. This can be done with pen and paper in a dedicated notebook or on index cards. Or, you might just keep an Excel spreadsheet of all of the materials you are consulting for a project.
Citation managers like Zotero, RefWorks, and Mendeley help automate the process by working with your web browser to grab the information about a source (author, title, publication, etc.) with the click of a button. They can even be integrated into word processing software to automatically generate properly formatted citations and bibliographies.