An annotated bibliography is a type of bibliography that includes an author's commentary on the source in addition to the source's publication information. Learn about the purpose of an annotated bibliography, Types of Annotated Bibliographies. There are two main types of annotated bibliographies: descriptive or informative. Analytical or critical. Descriptive or informative. There are two main types of annotated bibliographies: Descriptive or informative. Analytical or critical. Descriptive or informative annotated, this document will explain why annotated bibliographies are useful for researchers, provide an explanation of what constitutes an annotation, and describe various ones. An annotated bibliography is a list of citations to books, articles and documents. Each quotation is followed by a brief, generally descriptive word and. There are generally four types of annotations - Descriptive annotations which describe the work. Summary annotations that provide a summary of key points. A bibliography is a list of texts or other resources related to a particular subject or theme. It is usually formatted in a particular referencing style, such as: The annotation appears on a new line directly after the source citation. The entire annotation is indented, to clearly indicate when the annotation ends and a new source appears. According to Turabian's guidelines, annotations should be formatted the same way as the main text of any article: double-spaced. Left aligned.Annotation is a type of structured note on an article, research or book that can be used as a reference for future research work. It includes a reference citation and an overview of that source. Once your APA annotated bibliography is formatted, you create a citation for each entry. The composition of your citation varies depending on the type of source you use. For example, a book citation in APA is different from a journal citation. Therefore, when creating your citation, use the format designated by the APA for that specific source. The two types of annotated bibliographies you commonly encounter in MLA format are the abstract and the evaluation annotated bibliographies. An annotated summary bibliography provides a summary of the sources. An evaluative annotated bibliography goes more in-depth by evaluating authors and providing criticism. A bibliography is a list of books, articles, films, etc. on a particular subject. An annotated bibliography includes a paragraph after each citation that summarizes the work. An annotation can help the reader determine the value of each work on the subject and the contribution it might make to their own research. This approach is the most common type of annotated bibliography because it incorporates elements of both descriptive and analytical annotation types. Thus, in addition to a summary of the main ideas of the source, the annotation provides an assessment of its strengths and weaknesses to indicate the quality of the source and its relevance.