The Purdue Online Writing Lab (OWL) offers a good explanation and examples of annotated bibliographies and a few annotated bibliography samples (MLA and APA).
While searching, if you are getting too many results, practice performing searches with Boolean operators (AND, OR) to find materials about a topic.
AND
The green circle represents people who own homes.
The purple circle represents solar heat.
The gray overlap of the circles represents people who own homes and heat with solar.
OR
Both circles as a group are people who own homes or heat with solar.
Examples: