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An annotated bibliography is a bibliography that gives a summary of each of the entries. The purpose of annotations is to provide the reader with a summary and an evaluation of the source. Each summary should be a concise exposition of the source's central idea(s) and give the reader a general idea of the source's content.
Annotations may be written with different goals in mind.
This type of annotation defines the scope of the source, lists the topics and explains what the source is about. In this type of entry, there is no attempt to give actual data such as hypothesis, proofs,author etc.
This type of annotation is a summary of the source. An informative annotation should include the thesis of the work, arguments or hypothesis, proofs and a conclusion.
Most annotated bibliographies contain combination annotations. This type of annotation will summarize or describe the topic, and then evaluate the source's usefulness and a summary .
Sample entry of an APA style annotated bibliography: