This guide is meant for quick reference. This information comes from the Hacker Handbook: A Writer's Reference. For more detailed information about how to use Chicago style, please reference your Hacker Handbook, CMS-4 Documenting Sources (p.510), consult the Chicago Manual or the links on this page. You can also contact a librarian using the information in the box to the left! The Chicago Manual of Style includes two reference styles: Author-Date and Documentary-Note (or Humanities) style. The humanities and social sciences tend to use the Documentary-Note style. The sciences usually use Author-Date style.