There are two types of abstracts: informational and descriptive (from Purdue OWL)
Informational abstracts
Descriptive abstracts
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From Purdue OWL
A bibliography is a list of sources (books, journals, Web sites, periodicals, etc.) one has used for researching a topic. Bibliographies are sometimes called "References" or "Works Cited" depending on the style format you are using. A bibliography usually just includes the bibliographic information (i.e., the author, title, publisher, etc.).
An annotation is a summary and/or evaluation. Therefore, an annotated bibliography includes a summary and/or evaluation of each of the sources. Depending on your project or the assignment, your annotations may do one or more of the following.
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Sample APA AnnotationEhrenreich, B. (2001). Nickel and dimed: On (not) getting by in America. New York: Henry Holt and Company.
The annotation above both summarizes and assesses the book in the citation. The first paragraph provides a brief summary of the author's project in the book, covering the main points of the work. The second paragraph points out the project’s strengths and evaluates its methods and presentation. This particular annotation does not reflect on the source’s potential importance or usefulness for this person’s own research.
For information on formatting APA citations, see our APA Formatting and Style Guide.