YOU SHOULD BE USING THE MLA CITATION STYLE FOR YOUR WORK IN THIS CLASS.
An annotated bibliography includes a properly constructed list of the resources you have used and a summary and an evaluation which appear directly below each resource being described.
The requirements for your annotations (summary and evaluation) vary depending on what your instructor requires. For example, sometimes a professor may want the annotation to evaluate the resource. Other times, you may be asked to include information on why an item is useful to you in this specific paper – this means you are required to reflect on its value in supporting your project, paper, or thesis claim.
For a thorough discussion on Annotated Bibliographies see the Purdue's OWL - Annotated Bibliography page.