Chicago Manual of Style (online through Gitenstein Library)
Provides full-text access to both the 16th and current 17th editions. Also available: A Citation Quick Guide, Video Tutorials, Users Forum, Teacher & Student Resources section, and a list of Q&As. Look to Part III of the manual, Source Citations, for chapters on the two sub-styles: “Notes and Bibliography” (used primarily in the discipline of history) and “Author-Date” (used primarily in the social sciences).