What is a Chicago Style Annotated Bibliography? According to Modesto Junior College, while doing research for your project, you often get a lot of information to add from many different sources like books, journals, research articles, and more. Adding the sources of that data in the citation along with a summary creates an annotated bibliography often presented at the end of the project. This synopsis provides a way of assessing the significance of each source. While doing citations in Chicago style, you need to adhere to a set format, which is outlined in the Chicago Manual of Style (CMS), along with a brief annotation. The following are some key elements of an annotated bibliography in the Chicago style: