This site from the publishers of the Chicago Manual of Style provides answers to frequently asked questions and examples for citing research (see the Quick Guide.) Some areas of the site are limited to members. An online subscription to the full manual is available for purchase.
This libguide from Cornell University (linked with their permission) succinctly provides guidance on creating an annotated bibliography and gives a couple of sample entries.
Olin Library Reference
Research & Learning Services
Cornell University Library
Ithaca, NY, USA