It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
A bit dated but a great example of critical annotations: the audience, special features, where the book or resource fits within the context of linguistics and differences between publications. The link shows an excellent chapter.
Example of Annotation
Notice the various types of information and evaluation provided.
Example from: DeMiller, A. L. (2000). Linguistics: A guide to the reference literature. Englewood, CO: Libraries Unlimited.