For writing an Annotated Bibliography assignment, you will want to use the official publication manual or guide for the citation style that you prefer (MLA, APA, Chicago, etc.). All of the publication manuals provide examples of how to format Annotated Bibliographies. You can search for the publication manuals in our catalog, Library Search.
In addition, there are some great online resources that have examples of Annotated Bibliographies:
Purdue University Online Writing Lab - Annotated Bibliography Samples
Cornell University Library - The Annotated Bibliography
University of Wisconsin-Madison Writing Center - Annotated Bibliography