An annotated bibliography is a list of citations to books, articles, and documents. Each citation is followed by a brief (usually about 150 words) descriptive and evaluative paragraph, the annotation. The goal is to briefly summarise the source and/or explain why it is important for a topic. They are typically a single concise paragraph but might be longer if you are summarising and evaluating. The purpose of the annotation is to inform the reader of the relevance, accuracy, and quality of the sources cited.