An annotated bibliography is a list of sources with a short summary/evaluation of each called an annotation. The purpose of the annotation is to give the reader a general idea of the source's content and to state its relevance to the topic or field of study. The requirements for these assignments are generally set by instructors, but the sources should be listed in alphabetical order and follow a specific citation style such as APA, MLA, or Chicago.
The citation should follow the bibliographic style requested by your instructor. It will follow the same formatting guidelines of the style, such as APA, or MLA. For more information please refer to the Citation & Style Guide.
The annotation follows the citation and is typically 150-300 words, however, the length will depend on the purpose along with the assignment requirements. Depending on the assignment, the annotation could include a simple summary of the source, or, it might include the source's strengths and weaknesses, its conclusions, why the source is relevant, an evaluation of the research, etc.