Purdue Online Writing Center (OWL) provides sample entries for the three main types of annotated bibliographies using APA, MLA, and Chicago styles:
An excellent annotated bibliography by a geography student follows. Note how he takes advantage of all of the stylistic advice offered on the previous page, and how the paper’s sections begin to take shape even in the source descriptions. Note also that the writer's tone is upbeat and informed. We get a strong sense that the writer cares about the topic and will make it interesting to read about.
How to write an annotated bibliography | SFU Library
An annotated bibliography or annotated bib is a bibliography (a list of books or other works) that includes descriptive and evaluative comments about the sources cited in your paper. These comments are also known as annotations.