This short video from Purdue OWL provides a nice introduction to annotated bibliographies.
An annotated bibliography is a list of citations, (a bibliography) in which each citation is followed by a brief summary and evaluation. The following examples will help you understand how to create your annotated bibliography.
This short, self-paced free tutorial from APA takes you through the basics of APA Style 7th edition.
The books below may be helpful as well.