Ithaca College has a couple of great resources on Annotated Bibliographies:
Their guide to Annotated Bibliobraphies
https://ithacalibrary.com/sp/subjects/AB
Their interactive tutorial
http://ithacalibrary.com/research/annot_bib_tut/
The Olin and Uris Libraries at Cornell University have created an excellent guide to how to prepare an Annotated Bibliography.
Olin and Uris Libraries How to Prepare an Annotated Bibliography
The "Owl" writing lab at Purdue University also has information on creating an Annotated Bibliography
1. Summarize
2. Evaluate
3. Explain how it fits