A parenthetical reference follows a quotation or paraphrase used in the text of your paper and leads the reader to the complete citation in the works cited page. Usually the author, year of publication are sufficient. (Gibaldi, 2007)
For more detailed information and examples, consult:
An annotated bibliography is a list of sources formatted in the manner of a bibliography, but contains a short paragraph after each entry. The paragraph provides a brief summary of the article, and it's relevancy to the main subject.
When creating a annotated bibilography, consult with your professor about any questions you have. Assignment requirements may vary according to the subject and professor.